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Patent:US2513532
| Patent: | US 2513532 |
| Title: | Key-Operated Adding Machine |
| Date: | 04.07.1950 |
| Place: | |
| Country: | USA |
| Person: | Theisen, E. J. (P) |
| Company: | |
| Internal Links: | |
| Keywords: | |
| Link to the patent office: (without guarantee) |  US2513532 (espacenet), US2513532 (uspto) |
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