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Patent:US3009634
| Patent: | US 3009634 |
| Title: | Ten-Key Calculating Machines |
| Date: | 21.11.1961 |
| Place: | |
| Country: | USA |
| Person: | Allward |
| Company: | Comptometer (P) |
| Internal Links: | CL 235/60 allows non-decimal calculations (e.g. British money) |
| Keywords: | |
| Link to the patent office: (without guarantee) |  US3009634 (espacenet), US3009634 (uspto) |
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