Comptometer
Sign in to savethumb|upright=1.2|Model ST (1930s) thumb|upright=1.2|Prototype of the first all-electronic desktop calculator marketed by of the United Kingdom|UK
Wikidata facts
- Image
- Comptometer Model A.jpg
Show 2 more facts
- Commons category
- Comptometer
- time of discovery or invention
- 1887-00-00
Sources (1)
via Wikidata · CC0
~15 min read
Article
24 sectionsContents
- History
- Origins
- The first comptometers
- Comptometer and comptograph
- Competition
- Companies and trademarks
- Felt & Tarrant Manufacturing Company
- Comptograph Company
- Comptometer Corporation
- Bell Punch Company – Sumlock Comptometer Ltd
- Victor Comptometer Corporation
- Development
- Wooden boxes
- Model A
- Model B, C, D
- Model E
- Model F
- Model H, J, ST
- Model K
- Model M, WM
- Post World War II models
- See also
- References
- External links
thumb|upright=1.2|Model ST (1930s) thumb|upright=1.2|Prototype of the first all-electronic desktop calculator marketed by of the United Kingdom|UK
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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