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Patent:US2753117
| Patent: | US 2753117 |
| Title: | Mechanism for Adjusting the Resistance to Key Depressions in Calculating Machines |
| Date: | 03.07.1956 |
| Place: | |
| Country: | USA |
| Person: | Walker, E. C. (P) |
| Company: | Felt und Tarrant (P) |
| Internal Links: | Comptometer |
| Keywords: | |
| Link to the patent office: (without guarantee) |  US2753117 (espacenet), US2753117 (uspto) |
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