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1930 Comptometer Office Adding Machine Indianapolis American Advertising Blotter For Sale
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1930 Comptometer Office Adding Machine Indianapolis American Advertising Blotter:
$14.99
1930 Comptometer Adding Machine Advertising Blotter. - - - DISCUSSION: “The comptometer was the first commercially successful key-driven mechanical calculator, patented in the United States by Dorr E. Felt in 1887. A key-driven calculator is extremely fast because each key adds or subtracts its value to the accumulator as soon as it is pressed and a skilled operator can enter all of the digits of a number simultaneously, using as many fingers as required, making them sometimes faster to use than electronic calculators. Manufactured without interruption from 1887 to the mid-1970s, it was constantly improved. The mechanical versions were made faster and more reliable, then a line of electro-mechanical models was added in the 1930s. Notably, it was the first mechanical calculator to receive an all-electronic calculator engine in 1961, with the ANITA Mark VII model released by Sumlock Comptometer. This created the link between the mechanical calculator industries and the electronic. Although the comptometer was primarily an adding machine, it could also do subtractions, multiplication and division. Its keyboard consisted of eight or more columns of nine keys each. Special comptometers with varying key arrays were produced for a variety of special purposes, including calculating currency exchanges, times and Imperial weights” [Wikipedia]. Blotter. 9”x4”. Minor wear, light soil, unused. SHIPPING NOTES: All ephemera & photos are shipped First Class in a board-reinforced card mailer with a large red DO NOT BEND sticker. We combine shipping charges on orders for more than one item- you pay the shipping fee for your first item, and any other items that you order at the same time are shipped with it for no additional charge [If you buy more than one item please ask us to send a revised invoice before you pay]. Stock #44152 Joslin Hall Books & Ephemera
Selling books & ephemera since 1983 - Member of the Antiquarian Booksellers Association of America
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1930 Comptometer Office Adding Machine Indianapolis American Advertising Blotter $14.99
Methods of Operating the Comptometer 1895 EDITION Felt and Tarrant 40 pages $19.95
Sumlock comptometer Anita Mk8 Operating Instructions manual 59 pages $19.95
Comptometer Felt Tarrant Instruction Operations Manual year 1944 32 pages $15.00
1930 COMPTOMETER CALCULATOR MACHINE SECRETARY OFFICE DES MOINES IOWA AD 7047 $21.95
Chicago IL * Victor Comptometer Corp. 1960s Adding Machine 6-Horse Team $5.95
Comptometer Model H Felt Tarrant Instruction Operations Manual year 1921 37 pgs. $16.95
1931 Comptometer Ad - Cuts Figure Work Costs $19.99
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