From: David
E-mail: dpadam@usa.net
Pickett Model N4-ES Vector-Type LOG LOG DUAL-BASE SPEED RULE-yellow-in light tan leather case w/ carry strap/clip, copyrighted 1959--Like New Pamphlets: "How To Use Dual Base Log Log Slide Rules" by Maurice L. Hartung, Pickett & Eckel, Inc. 93+ pgs.--Excellent Cond. "How To Use Dual Base Slide Rule Exponential Ln-L Scales" by Maurice L. Hartung, Picket & Eckel, Inc. 16 pgs., dated 1959--Excellent Cond. Be$t Offer[s]