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Comptometer

Mechanical Computer Design

The comptometer was the first commercially successful key-driven mechanical calculator, patented in the United States by Dorr Felt in 1887.

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Significance
It was the first commercially successful key-driven mechanical calculator. 1
Sources
1. Wikipedia: Comptometer
Body, Introduction
Quote, Body, Introduction
The comptometer was the first commercially successful key-driven mechanical calculator, patented in the United States by Dorr Felt in 1887.
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