hi daddy....................... :) congratulations on the patent! love, mari

site looks good, &very interesting i will have take more time to study. is eye catching - eddie

I collect and repair Marchant Mech calcs. However I wired lots of Wang equip while I was the Office Equipment service Mang. at WSU in Pullman, WA. Nice Site

James, as you know I think your patent is great and conforms more easily to the way we think. I had a chance to check it out here and I like it. One question: Is the keyboard going to conform to numeric key-pads or are you proposing new locations for the numbers as you have on your web site here? I would opt for keeping the current key-pad and including extra keys from your idea. I'd like to also reiterate my suggestion that a good idea for the first market of this is childrens computers to make it easier for them to learn and to introduce your idea to an "up-and-coming" generation. That's all. Thank you for letting me visit your web-site. Good job! It looks terrific! Keep up the good work! Keane is lucky to have you!

James: Great job! I'm looking forward to even more material and photos about my favorite "obsession" - vintage pocket calculators! Thanks for taking the time to set up the site. We can use all the calculator related web sites we can get! Guy

Saludos y felicitaciones desde Quito Ecuador. Ricardo Ortega

That's pretty cool! Da gusto ver a un compatriota haciendo cosas tan interesantes. Felicitaciones!

ESTIMADO JAMES HERNAN: UN GRATO PLACER EL HABER LEIDO ESTE DIA EN EL DARIO HOY, EN EL INTERNET TUS LOGROS CIENTIFICOS NO PUEDO MAS QUE CONGRATULARTE POR TU INVENTO HECHO EN ESTE PAIS DE TANTA OPORTUNIDAD, SIGUE ADELANTE Y FELICITACIONES OTRA VEZ MANOLO A. LECARO

This does seem much easier when doing data entry or calculations.. I work in tech support for a company that develops software for depreciation calculations, for both tax and financial reporting purposes, and am often called on to "prove" my softwares computation, ie do them by hand for the customer to prove that the numbers are correct. Often the customer will rattle off a huge number (in an irritated voice), so I have to take it down quickly. After a while you get good at it, but doing it with this tool will be easier. By the way, my parents are Marco and Fabiola Vaca, I believe you know them.

This site is an example of how a personal site can be well designed AND useful. Thank you

Your web site is impresive and the articles are very professional-looking. Your extended numeric entry, from what I tried, seemed nice. It took a little to get used to, but once I got the hang of it, it went pretty well. It seems to be especially good for numbers with a fair amount of zeros. Kenton Green,

Hi, I like the X number idea, I think your barriers will be habitual rather than anything else. I guess your next step is talking a manufacturer into it? I collect various calcs and LED watches and deal with Tom and Guy quite a bit. Regards Steve Haynes

I am always interested in collecting information on calculators. I think this site will be very helpful

He visitado tu Web y me he emocionado mucho por tu invento. Sé que tendrás exito con él y estoy segura que las futuras generaciones lo usarán como algo natural que siémpre estuvo "ahí", y la verdad es esa: estuvo siémpre en tu mente. Felicitaciones y gracias por llenar de orgullo el apellido Redín. Tu hermana Olga.

¡Felicitaciones Jaime! Espero que no solo sea un triunfo "intelectual" sino también comercial.

After posting ads for my Curta calculator on several different web sites without any sucess, or bids, I placed an ad on the calculator email list, calculate-list-recipients@x86.webcom.com. This email list was brought to my attention by James Redin. To my surprise and pleasure, I had my first full price offer within 30 minutes of placing the ad. After the first day, I had a total of 8 full price offers on my Curta. Thank you James for all of your wonderful help.

I visited and I like your pages. Yes, I love calculators and I made some pages, too. "http://www.kako.com/museum.html" and "http://www.kako.com/rpncalc.html"

James, What a great geathering of information. I am impressed by what you younger folks know. My knowledge is limited to the old mechanicals. However while running the office machine service department and Washington State University, I had lots of fun wiring in the Wang Calculators for them and other companies around the area.

It is a very nice homepage. Tha album is great

James, What a small world. I live and teach in Santa Clarita. I teach second grade at Pinetree Community School over in Canyon Country. I became interested in calculators when a parent brought in an HP 65 to show my third grade class sometime in 1975. I have often accused HP that the blinking red leds really were subliminal commands to"BUY ME! BUY ME!". I went from a 55 to 67 to 97 to 41C, CV, CX. Of course now I have an ancient Pentium 166 system. (18 months old!!!!). I really enjoyed your site. It is a nice site and local too!

HP-80 note: At a meeting at HP in San Jose circa 1980 we were told that about 2-3 weeks after the introduction of the HP80, HP support received numerous calls saying that the HP 80 was calculating incorrectly. The problem turned out to be the fact that it used 10 digits internally while the current books of tables only had 2-4 digit accuracy. The HP-80 was more accurate than the books then in current use.

Cool site! Your "000" number-entry method is TOTALLY easy to get used to, and even though I only used it for a few minutes, I already miss not having it on my HP48! Joe

A great site for a calulator fan. Lots of background information and many links I´m sure going to visit. Thanks.

Very nice site. I have a few old broken calculators, but my favorite is a mechanical Wizard circ 1960. Does anyone know anything about these email :laurie@nbnet.nb.ca

Great site, I invite you to visit my homepage, see you soon, lucky.

Hi The Garrett 2000 had Burroughs Panaplex Plasma display not red LED as mentioned in your album So sayeth my colleague Joe Murcko who designed and laid out by hand the chip that runs the Garrett 2000 when he worked for garrett in the 70's He is willing to talk to you by phone here at work if you want. Ed Cordner 760-966-1176

Hola Jim!!! Te hice una corta visita Diego

Great site! Threading through Jack Kilby

Regards from Slovenia ! Greta page !

Hello, James I was just checking out your site. You've done a great job. I'll be coming back here often. As a former Friden Service Rep., I am particularly interested in the articles about the Friden Mechanical Calculators. Keep up the good work!

EXCELLENT!

James: I just checked your new site - what a fabulous job you've done, both in content and layout! I hope you'll continue to add to this great resource - it's at the top of my bookmarks for calculator info. Regards, Bill

Very impressed! Like the patent. You're obviously a talented web page designer as well as a calculator nut. Keep the good ideas coming!

James, I like your website on calculators. So far, I think it's one of the best. I have been saving old machines for over 20 years, since 1964, because of my love for them. I'm glad they are getting the recognition that they deserve. I have always loved mechanical calculators and have been collecting them. I have hundreds now.

Hi James - You have an excellent site. Congratulations! I do collect a few mechanical calculators.

I collect Slide Rules. Also have many nice items for sale and trade. Looking for the unusual, unique and fun items too.

Hi Jaime, what a fascinating collection of calculators. I thoroughly enjoyed browsing through it. If you want a Curta calculator, I'll be glad to give you mine. Regards to you and family, and since the time is fast approaching, MERRY CHRISTMAS to you all. Love, Sasha and Vera

Good site. You will be able to enhance your list with the info I have sent.

James, I still don't have a graphical browser going; however, I used the local library's, for the second time, to see your site. The simulated calculator is really interesting; I like it. I admire the amount of work and Web research you did in compiling the History sequence. I think it will be the definitive set of articles on the topic for some time to me.

Dear James, I can confirm that he MADIX is a Sprossenrad machine. In fact it is a copy of the FACIT machine, made in eastern germany. There is a model in Breker Auction catalog dated oct 24, 1992. They say it was made in 1958. I am not sure that it is exactly the same model, although it looks very similar. regards MICHEL

Very nice (and useful) site! Your site really is *lovely* (and full of good "stuff." Those links to the various on-line calculator apps are lots of fun...).... Brad, http://www.cloud9.net/~bradmcc/

Congratulations on a splendid site

beautiful web page.

Hello James, A very COOL homepage. I liked the article about RPN calculator... Keep up the great JOB!

Hi James - sorry I didn't get to this sooner. You have really done a fabulous job on this site, both the content and the design of the site. I look forward to each new addition. Best wishes, Skip

Wonderful nostalgia, especially for an ex Friden SR user who looks for data on a Wyle machine from the 50's.

Good for you James! There must be something nice about having earned a patent. I tried your number entry method, and it *does* make sense. It continues to be clear that you've put a lot of loving care into your website, and it has "paid off". It really is a fine web site. Best wishes for further improvements that, until "this afternoon" (or wherever is that carrot on a stick whose distance always remains a constant in front of the donkey's nose...), you could never previously have imagined.... \brad mccormick http://www.cloud9.net/~bradmcc/

James,original thinking is not always rewarded. What I like most about your X-number idea is that it is simple, easy to comprehend and is practicle. Thanks again for the help on the Saxonia and I wish you good sucess on the patent.

This is a great web page.

Bravo for your site !

Very, very nice site. Could not resist clicking to it from within our newsgroup

Excellent site! I've enjoyed browsing through it, and it's already provided me with some information that I needed -- the dates of an 18th century builder of calculating machines.

Congratulations!!! I'm looking for information about this kind of machines and your inventors and finally I found. Thank you.

My compliments to the chef.Great website! I am looking to purchase a wooden case comptometer,any help would be much appreciated .

James... What a great contribution you are making on your web site. I hope lots of folks take the time to 'pat you on the back.' Ernie http://users.lewiston.com/two/office.html

Nice page! I will link my page to yours. Please include a link to my page also. http://members.aol.com/LEXIKON2/FIRSTS.html Thanks.

comming from the home of dantiques its hard to get anything before dan.

An impressive resource !

You made a very nice site, and a very useful one, Thank's a lot Pierre

Good, informative site. Both of us enjoyed it. We like real trivia and things that we found in the museums in Washington D.C.

I saw your home page and in 1/2 of a quarter of a year this flattered collector finally got around to visit your site ... I'm impressed by the effort you're putting in to this. I feel obliged to redo my site. I will not change the URL, so there will be no confusion, I hope, to our common visitors. Best regards, Dan Bellander http://home2.swipnet.se/~w-21015/mycollec.html

I know you won't much care but I wanted to thank you for your site. I had to make searches about mechanical calculating machines, and SAVED MY LIFE. DOTPOINT/XNUMBER is the only place where I could find something,and that was VERY helpfull. So once again THANK YOU FOR SUCH A CONCRETE INFO SITE. Lobotom

i like the calculator

James Redin, Just wanted to compliment you on the excellent site at www.dotpoint.com/xnumber. As a member of both the IACC and the Oughtred Society, I have many of the artifacts you pictured and so I was very interested in what you had to say. I know it's very time-consuming, but keep up the good work.

JAIME, ES INCREIBLE COMO HA CRECIDO TU WEB SITE, FELICITACIONES POR TU EXITO Y QUE LLEGUE EL DIA QUE TU IDEA SEA RECONOCIDA MUNDIALMENTE. SALUDOS FERNANDO ALMEIDA.

Most interesting page. I have an old mechanical adding machine that i will have to dig out of the basemeent and see its' make & model.

From 1950 until 1987 I repaired and serviced Monroe Calculators. I also taught a school on the PC 1 and 570 printing calc. It was a very interesting and challenging job.

Surfing is fun; you come across great sites like these ! I've owned an HP-45 for about twelve years now and never knew about the timer. Thanks and congrats with the patent, it is well deserved Rob.

I was just surfing around on the net when I came up onto your cool homepage. You have done a very good job. I really enjoyed how you laid out your graphics and your use of color. There are so many bad sites out on the internet that is is a true joy to surf up to a really nice one like yours! I liked the links that you had chosen as well as the actual content of your own homepage as well. Keep up the good work, it is appreciated! I am the Webmaster of WD9GNG's German/American Homepage. I have been trying to get out and look at as many homepages as I can in order to see what other folks are doing. You have given me some good ideas on how a good site should be laid out!! Ken Wigger Onkel_Ken Webmeister WD9GNG's German/American Homepage http://www.angelfire.com/il/wd9gng

James: Great job on the web site. Look forward to more material in the future. This is really something to be proud of.

What a great site! I have been collecting slide rules and other calculators since the end of the 80th and I stumbled over your site when looking for some information about Faber-Castell and their slide rules. It was very nice to find more people really enthusiastic for both older and newer calculators. I'll bookmark this site. Good luck!

Can you help? Are the 4004 processors still being made by Intel or others? If so where could I purchase one?

My Arithma Addiator was given to me by my grandfather. Everyone at school is in awe of it as if it were some relic preserved for centuries.

Interesting site:-) Thanks for putting the energy and time into creating an information page about a misunderstood piece of technology. As a school district coordinator for mathematics education, I am constantly defending the practical use of calculators for tedious computation. Your insights regarding recent research on the calculator's effect on student achievement would be most welcome. I have information from Almeqdadi, Campbell, Dunham, Hembree, Jones, NCTM, NCSM, and Suydam; any other references would be a help. Thanks

I'm a student doing a project on the history and development of calculators. I'm able to use a lot of information from your site. Thanks, and if anyone out there thinks they have a good site with some more info on my topic, PLEASE e-mail me.

I am very impressed with this site. I have a modest number of old adding machines and calculators that I have collected over the past 20 years. Most are of the "garden variety," but I have one that is significant: "The Millionaire." I am very curious as to its value. It has push buttons instead of the levers that I've seen on this site. Was there more than one model of "The Millionaire?" I realize that this may not be the forum for such questions, and if not, I thank you for the excellent site anyway. I discovered LOTS of valuable information.

I got interested in calculators and adding machines after buying a set of books at a used book store. The books (set of 2), " Ingenious Mechanisms for Designers and Inventors" copyright 1930 by the Industrial Press of New York City. The books had a section that explained (in very good detail) how the adders and accumulators work. After that, I was hooked. I am glad to see others are also appreciative of these inventions of our grandfathers and great-grandfathers time. Cams, ratchets and levers may have been replaced by microprocessors, servos and LCD displays; but mechanisms like some of these old machines hide inside their cases are real works of art in their own right. Thanks for your web pages

enjoyed your website.Looking for advice on how to sell Felt &Tarrant Comptometer

Great Web site and I am in the business! Especially enjoyed the excellent writing in Mechanical History Parts 1, 2 and 3 - best I have seen on the Web. VERY interested in MADA, TIM, Steiger Millionaire, Schildt, comptometer, Curta and Fowler machines.

Hello, It is clear that this site is a 'must see' for collectors. Of course, we'd like more (of everything), but as usual it all relies on submissions by all the people interested. This too often means not much... So please James don't get the impression that no one is interested. It's just the opposite ! Stay around, for as long as you dare. Thanks.

You have a fantastic website. I learned many new things from your three part "A history of Mechanical Calculators" I want to thank you and compliment you on the excellent work that you did. I take down my non-existent hat to dedicated people like you and Erez who do such a fantastic job. I am sure that there are many others like me who learn a lot from them. I found your web site extremely helpful.

Curta Calculator & other interesting calculators can be found on www.curta.com

I'm doing this "essay" about calculators in school and I think this site will be very helpful..... Anyway, it's really a great site. (Love the online calculators!)

Hi, I´ve taken my calculator museum offline! URL: http://www.geocities.com/SiliconValley/Peaks/2401/index.html Regards Theo Lumens

Just found youe sight and will check it out. Thanks for sharing it.[>5 chars]

An eminent site. Congratulations!

Jim, Wonderful site. Can you tell me, when was the first comercial mechanical adding machine that could total to a negative number (rather than a nine's complemented number?) Thanks so much for the info-- Jeff Van Wagenen

I really enjoyed your site. I did a search on http://www.dogpile.com for "napier's bones" and found your site. I've looked at several sites relating to Napier's bones, but yours was by far the most comprehensive. I was especially delighted to see information on the abacus. I am a computer geek by trade, and I have asked several people if they knew how to use one. No answer until now. Thank you, oh great one! Very nice site. I've done web publishing myself, so I can appreciate your hard work. You're one serious bean counter. Many thanks. You bring good things to life.

Oh I'm just so glad that there is so much to discover on this "narrow" interest in mechanichal calculators so I want to thank you for keeping this site alive.

I have a Computer Museum here in Brazil.I have a lot of old calculators, like Friden,Curta,Olivetti,Mercedes etc. And I would like to keep a touch with you.

Hi ! Congratulations for your fabulous site Thanks Yves

I love the Marchant figurematic photo. I remember hearing family stories about these when I was a kid. Would love to have one.

Thanks for the inspiration and long years for your patent ! My wife: Arlene sent me to your page... Best of luck !

Great site, lots of useful information. Do you know where I can sell my Colmar's Arithmometre over the Internet? Thanks again.

Hello Please change my email address that you have for me and Joe Murcko adjacent to the GArrett 2000, Also I can send you a better picture of that calculator if you like / Ed edco@home.com

I have an old Walther Comptograph adding machine that I've had for a number of years. I did not origanally purchase the machine and have no books. Please advise if there is anyway for me to find out the model year or other information.

8/3/99 Very interesting web site! Believe it or not I still use my fractometer. Am looking to purchase another one. Mine is called a "sizematic" & measures about 2"x 10". It adds or subtracts feet, inches, and fractions down to 1/16". Does anyone out there have one?

I've got a Sinclair Scientific Programmable calculator c.1975. Boxed as new. Any info ???

Congratulations

Good, very good

Great Site! Need to get more people to start collecting all types of calculators. Just like camera collectors, calculator collecting can very interesting!

Hi. I work for the Museo degli Strumenti per il Calcolo of Pisa and here I find a lot of information about many calculating machine of our collections. Thanx

Querido Tío: Para tus sobrinos es un verdadero orgullo encontrarte y entender tu ingenioso método de cálculo. Recibe nuestra admiración y deseo de que llegues a culminar tu proyecto con mucho exito.

I enjoyed the X-number site! For an on-line Curta (Netscape only -- IE to come) and other Curta information, visit the Curta Calculator Fan Club site at http://curta.org

Very interesting site. I am a volunteer in a middle school, preparing students for Basic Math Standards and usage of calculators. Big challenge: great variety of calculators.

Great site. Really a hystorical description.

I tried your numerical system and after only two tries i know your method is more natural

I am now leaving your site and wish to say how interested i am in things mechanical. I have and "Original-Odhner" made in switzerland. The machine is painted grey with a "wrinkled" finish. The handles appear to be dark blue plastic type material. How can i find out its age and approximate value. Look forward to your return.

I have a large collection of Sinclair items for sale including most of the early calculators, microvisions,watches,multimeters,and even some old project 80 pieces. Anyone know a site I might post these on? Most of these are new and in boxes.

Merry christmas and a very happy new year , and thank you for this web site :-) Lennart

Great site!

I have enjoyed the visit to your web site. At Boeing Whichita we used a large mechanical calculator in about 1955 to calculate the square root for tooling layout. The machine had no square root button and we did the square root by subtraction starting at the left of a number until we got nines then added back and went to the next number to the right. It worked but it took too much time so we started useing 15 place trig tables and trig. The memory is not too great but I remember some joker found a mumber and played a march on the machine which really did a danc when some calculations were tried. Thanks for the trigger of the memory glands. Elmer Jennings

Keep up the good work on your wonderful site! By the way: will the world ever see actual electronic calculators manufactured with the X-Number keyboard? I LOVE that idea -- and I would buy one without a second thought! Good luck to you with that!

Would like to find any model Friden. Prefer an STW. Just one comment, the ST was not the first model. The Model A was. I had a dark green cover, red & black & white buttons & is very rare.... Thanks much...

Hello James, As a frequent visitor of your site I'm happy to tell you how useful it seems to me. About every other day there is something to see here (whether in the forum or at some site linked to on your links page). Speaking of this, some links are no longer valid, and setting them back to normal would be nice. Thanks a lot ! G.E.

Your site is super! Fantastic links to original patents.

What more can i say? I'm impressed.

nice site, i just started collecting calculators (because i have ended up with a few from various sources so decided to get some more). i never realised there were so many webpages about calculators! anyway my homeage is at http://www.trash80.org.uk/ ... take care!

My stepfather had a pinwheel calculator, which he called a "concomitant machine". It may have been Swedish. Since his death, I have been unable to locate it. I have learned more about this type machine here than I have in the last 25 years. Thank you very much.

Love this site and find it a wonderful reference. Vintage technology fans are encouraged to submit artifacts from your collections and promote your website too at the time-warp archive of vintage technology at www.time-warp.org Also please send us announcements for upcoming events!

My wife and I found a Borroughs Adding Machine in an antique shop in Childress Texas and are wondering what we have found. It looks much like the one pictured with the history of William Seward Burroughs' first adding machine. The one we have has nine rows of seven keys. Approximate age? Thank you for allowing us to visit your website. Kenneth & Linda Casey

jean marguin ! where are u from are we related? my dad is from macon , france. where all the marguins may have originated from....do tell

I have finally started to work on a book on small adding devices. I have been and still am collecting info, but have started to write. Also, I will be giving a talk on this subject at IM2001 next September in Munich. Am interested in communicating with anyone interested in this topic. Thank you.

Happy New Year ! Your site keeps getting better than ever.

This adding machine stuff is truly addictive! Thank goodness for this website which answers so many of my questions. Way to go, James!

Nice article about Kilby and Noyce. you explain it very well. "The Tyranny of Numbers," was quite a puzzle to solve. Thanks.

This is an amazing website, and I am reall impressed with how practical, efficient and ingenious you design is. I am sorry that I didn't have a chance to visit your site sooner than this. Right now I am attending a conference and competition in San Jose, and since I have some time to relax I decided to see your website. I hope you are gaining a lot of progress on the development of your Visual C++ 6 based Xnumber program. I hope to see you sometime soon. Sincerely, Sean Thad David Stewart

I have a large collection of calculators from 1974 and newer.

Very interesting site, especially when you're a newbie! Thanks for information about collecting calculators!

Thanks for your excellent job on your web site. It certainly is an accomplishment and a contribution to the field.

I have a sears 6 calculator, similar to the add-amatic. Could you tell me what year this was popular and is it a collectible?

Great conversation today. I reached Rauck and he is clearly the guy to clean up my ST10-170834. Your help was invaluable! Picture will be on the way ASAP.

Man u would only like this kind of stuff i u were a book woorm i mean who woud want to mail a site about Maths eeuuuuu if u ask me i would play games

This is a great site! Really makes math fun! Thanks

fascinating and educational:a tremendous effort for our pleasure and knowledge

Thank you so much for memorializing and paying tribute to Dr. An Wang in your article "The Doctor and his calculators." I had the privilege of working for Wang Laboratories and meeting The Doctor and have been saddened to see that his name is seldom found in encyclopedias or mentioned when recounting the history of computers. It appears that some people seem to believe that computers began (and will end!) with Mr. Gates. I ran across your article by accident and it made me feel proud to have been associated with a company that had such a significant contributor to our society. Sincerely, Cindy Prescher

I'll use the information. We display several mechanical calculators, from 1916 to 1960, in our departament of Historical Computer Display at Stanford University. A photo tour is available at http://www-db.stanford.edu/pub/voy/museum/phototour.html.

Thanks so much for your help in finding the fractomator..You were very kind and helpful to us(who know very little about computers) Thanks again!!!!!!!!!!!!!!!!!

you sweet site dog!

Hi James! What an amazing web site! Your site is not only a great source of information for collectors; it also brings collectors together into a community of common interest. Keep up the great work - we all appreciate it!

hi a good site, anyway i'm looking for a calculator, its a casio 580.... do u know where i can get it?

James Redin, I think you are quite the amazing guy. Wow what a great website. I am so impressed. Oh, I plan to forward your page to a few others. In the meanwhile, I'll have to explore every inch of this site. P.S. I like your look. Wink.

About forty years ago I worked for Burroughs as a serviceman in Winnipeg, Canada. I worked on many models from the Class 1 up to the E101 small scale electronic computer. During my time with Burroughs I was instrumental in destroying so many of these machines that were brought in as trade-ins. Sigh. I'd love to get my hands on a Class 1 just for the memories and to show my grand-kids Thanks for the memories!

Ooo!! Looks like a fascinating site. I'm looking forward to spending many happy hours here. :-) Meanwhile, anybody know how to attempt the refurbishment of a 1950s-vintage Monroe mechanical calculator? Cool beast when it worked, but it was getting 'iffy' even when I got hold of it as a kid in 1975. Nowadays it just spins and spins unless I open the case and push on things 'til they engage. A most disorganized mode of operation, to be sure, and not very useful. Would love to restore its former glory. E-mail me if you know something that might help! :-) Thanks in advance!

Someone said they found MY name as a collector here, so I thought I should check out the site! Fantastic! I've bookmarked it for further exploration as time permits. So many calculators, so little time! It's nice to find so many other collectors! Hooray for a great site!

Tio Jaime: Estaba revisando logros de los Redin en el internet y me he quedado impresionado leyendo toda tu historia y todo tu proceso de formacion (a pesar de que ya sabia algo por lo que habia oido, pero no a fondo). Te felicito y que sigas adelante. Demian F. Redin

Happy New Year ! It´s always interesting to watch this site. Lennart

Dear Sirs, I would like to congratlte the Sharp co for the excellent quality of the products. I have a pocket scientific calculator (model EL-508A) from 1981. Is incredible, but it is in fuction, even now, with his original batteries (Sharp also)....20 years. I am impreased. Thank you!

You helped me a lot with my project about the history of calculation. I practically did half my project based on your site. One problem: I couldn't find the date of posting/revision which I needed for my list of references. Oh well, can't have everything! Thanx.

I worked at Wang Labs, and consider it the highest point of achievement in my life. Finding your site touched me like you can not imagine. Out of 30,000 thousand employees, I would pay to find any employee that did not think Dr. Wang was a genius equal to that of Thomas Edison. I was not an executive of the company only an employee. Most people do not realize that without his genius, a lot of us would be weeding corn fields. Thanks,

James, Thank you for the information you publish on your web site. I'm not a vintage calculator's collector, just a bit interested in historic business machines.

Obtained an addometer when we purchased a machine shop. The information I obtained on this site was very interesting. Thanks for the great work in setting it up.

hi! in a collector from germany. you made a very nice page. is there any chat/discussion-forum, where i can put questions and get newer informations?

Found this site while looking for info on a Ray Subtacto-Adder from my Dad's estate. Would like to sell it. In very good condition. Any offers? Email me at bshelton@c4treasure.com. Thanks!

hi. wooooonderful site. im a (very, very) small collector from germany.too sorry: i cant see your pic of the facit s. can you send me one to complete my collection of pics? sabineundsigi@t-online.de thanx

Playing around on your website, I was amazed at how much easier it is to enter numbers using the extra thousands and millions keys. I hope you find some takers for your approach. As I said, it was a surprising improvement.

I have to work on mecanical calculating machine so your web site has been very interresting thanks

Hello Grate memories, I used a Marchant in the mid sixties as a wages clark in England, although the sumlock was the most common in our office, I loved the old Marchant, soon the electronic Anita came in, and that was that, but nothing adds as fast as a mechanical machine.

James: Felicitaciones por tu maravilloso invento.

Your site is really a mine of preciuous information. When at the university I have used an electric Monroe (don't remember the model!) and, afteward the mythical Olivetti Programma 101. Thanks for your effort.

Ben verzalmelaar van schrijfmachines, rekenmachines, Kasregisters en duplicators. Ben in het bezit van +- 170 machines

i am looking for a monroe 10 key calculator model numbers 3140,4130, or 2125. I am in need for one to use for college course. where might i be able to locate one to purchase? any info you have would be appreiciated

I have managed to come across a Magic Brain-like troncet and thanks to you I now know how to use it. Happy New Year !! Lennart

Hello James. It was a real surprise (read SHOCK) to see my site listed as a new addition on the collectors' sites page ! To say the truth, your site has been some kind of shrine for my devotions to the calculator gods like Guy B., Bruce F. (writers of THE BOOK), and others. Such a nice central place for us calc addicts ! It is quite frightening to come a little uncomfotably closer to thes big guys. Thank you, I read the Forum really often and I like your site. Please stay around another 5 years ! Mmmm... this may prompt me to create an english version of my site ? Please everyone, don't hesitate to correct any mis-statement there. Thanks again James.

Very informative. Former Friden employee...

Exelent site: Have you ever looked at Glasier,s calculations where his error points fall after 120 which Glasier showed that the letter e worked to 137 which added up

Hi James, I never knew you have this whole other world to live in! Very nice website. Hope you are well and enjoying things in the "K" world, too. Regards, MikeB

I REALLY LOVE THIS SITE. KEEP IT UP.

I like your idea. Good luck with it. Any ideas on telephone keypads? Why is their order opposite to that of calculator keypads.?

My friend Chuck Gray Worked for Friden for about 30 years and was service tech. I worked 40 years, for companies that merged until we ended up withT.R.W. Mine were Commercial Controls with the Flex-o-writer we merged with Friden Calculator where we put a calculator in a desk and a Flx-o-writer on top cable connected to-gether as a computer. Then we went into all types of computers. Every now and then we run into a Friden service tech. Thank you for the site you have

history of sundstrand beyond the mechanical calculator www.schoepski.com/states/illinois/sundstrand/sundstrand.htm

Thanks for the history. I'm surprised there is no mention of Konrad Zuse and his mechanical binary calculator/computer the "Z1".

Does anyone know the value of a @Millionaire@ calculator, or where and when they were made?

I own an Exactus Mini-Add along with the original leather case,instructions and even the original 12 month Guarantee. I would like to hear from anyone regarding this machine, to learn more about it.

I HAVE AN OLD BURROUGHS CALCULATOR #5A61389 AND OLD SURVEYING EQUIPMENT, NON DIGITAL, FROM A CLOSING GENERAL CONTRACTOR CONSTRUCTION BUSINESS

Your patent is an excellent idea! It would serve the financial field well. I will be checking this site often. Keep up the good work.

Where can we see your watch collection?

In memory of my career (I was working in bank to the change) I am looking for a mecanical calculator manufactured modell MULTO 113 or 23. Please can you sell me this modell or say me where I can buy it.

Hi , I was looking for old Friden Employees - Where is every one?