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c. 1920 Felt & Tarrant ADDING MACHINE - COMPTOMETER Chicago USA
$22.50 USD

Sold on: 2013-Jul-16

Marketplace: eBay
2 Treasure
0 Trash
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Detail:

The comptometer was the first commercially successful key-driven mechanical calculator, patented in the USA by Dorr E. Felt in 1887. A key-driven calculator is extremely fast because each key adds or ...




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