|PLUS Part Keyboard|
"Only machine of its kind on the market. All keys above the 5-key eliminated for handier size. Unsurpassed speed in addition. Subtracts and multiplies too." THE OFFICE - January, 1950 (Page 78).
" Look at the key tops of an old key-drive machine and you'll find 1-5 well worn, 6-9 comparatively unused! By keeping flying fingers below the 6-key, operators eliminate clumsy, slow reaches - and striking the 4-key twice is actually faster then reaching for the 8." THE OFFICE - January, 1950 (Page 79).
Computing Machines. Inc.
Source: Timo Leipala