Vintage Felt & Tarrant "COMPUTOMETER" 1920's

Description

Welcome To Trader-Bobs Ebay Auctions. Allow me to introduce myself. I am a professional ebay seller. I have been involved in retail sales for over 49 years, the largest portion, of these years, having been my own successful retail auto  parts / sales / repair business, which I started from scratch.  I take your satisfaction, VERY SERIOUSLY! If there is any problem with this  item you have purchased from me, I want to hear about it FIRST, before feedback is left!  So that the problem can be resolved.

thenextitemwehaveontheblockis!!!!!!!!

Trader-BOB's MUSIC offers a Vintage "Compumeter", early adding machine made by Felt & Tarrant, in Chicago.  Lks in pretty good shape. No idea how to use it. Heavy little thing.  The following is from Wiki.
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. Consequently, in specialized applications, comptometers remained in use in limited numbers into the early 1990s, but with the exception of museum pieces, they have all now been superseded by electronic calculators and computers.

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