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The comptometer was the first commercially successful key-driven mechanical calculator, patented in the United States by Dorr Felt in 1887.
History, Trade, Measurement & Companies
Explore the main themes, entities and connections around Comptometer. Start with the topic map, then use the sections below for research and deeper semantic analysis.
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| Subject | Predicate | Object | Confidence | Src |
|---|---|---|---|---|
| Comptometer | is a | direct descendant of the key-driven machine of Thomas Hill patented in the United States in 1857 and of the Pascaline invented by Blaise Pascal in France in 1642 | 0.90 | text |
| Comptometer | related to Bell Punch Company – Sumlock Comptometer Ltd | In | 0.60 | section |
| Comptometer | related to Bell Punch Company – Sumlock Comptometer Ltd | Bell Punch Company | 0.60 | section |
| Comptometer | related to Bell Punch Company – Sumlock Comptometer Ltd | British | 0.60 | section |
| Comptometer | related to Bell Punch Company – Sumlock Comptometer Ltd | Sumlock | 0.60 | section |
| Comptometer | related to Bell Punch Company – Sumlock Comptometer Ltd | The Sumlock Comptometer Ltd | 0.60 | section |
| Comptometer | related to Bell Punch Company – Sumlock Comptometer Ltd | ANITA Mark VII | 0.60 | section |
| Comptometer | related to Bell Punch Company – Sumlock Comptometer Ltd | The | 0.60 | section |
| Comptometer | related to Bell Punch Company – Sumlock Comptometer Ltd | Rockwell International | 0.60 | section |
| Comptometer | related to Bell Punch Company – Sumlock Comptometer Ltd | They | 0.60 | section |
| Comptometer | related to Competition | The | 0.60 | section |
| Comptometer | related to Comptometer and comptograph | The | 0.60 | section |
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