The Comptometer Super Totalizer, a mechanical calculator.
11:37
YouTubeJaap Scherphuis
The Comptometer Super Totalizer, a mechanical calculator.
This is a mechanical calculator, the Comptometer by Felt & Tarrant. This is a special version of the Model J, called the Super Totalizer. I explain how it works, and what all the buttons and levers do. This one has serial numbers J317903 and S1415. From the range of serial numbers found, it seems that some 85900 model J Comptometers were made ...
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Comptometer History
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