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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.

Facts
Year
1887 1
Significance
It was the first commercially successful key-driven mechanical calculator. 1
Sources
1. Wikipedia: Comptometer
  • Body, Introduction
    The comptometer was the first commercially successful key-driven mechanical calculator, patented in the United States by Dorr Felt in 1887.
  • Lead
    patented in the United States by Dorr Felt in 1887
View the Source
Wikidata: Comptometer
Wikidata Q572421, resolved via en.wikipedia pageprops (wave rule R-L)View the Source
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