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How the Comptometer Works
6:48
YouTubeMechanicalComputing
How the Comptometer Works
A visual explanation of how the Comptometer, the first practical key-driven calculator, works. Comptometers were manufactured continuously from 1887 until the 1970s ...
35.4K viewsJan 30, 2012
Comptometer History
Vintage 1950s Felt and Tarrant Comptometer Mechanical Calculator Showcase
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