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Patent:US2906454
| Patent: | US 2906454 |
| Title: | Ten-key calculating machine |
| Date: | 29.09.1959 |
| Place: | Gerstetten |
| Country: | USA |
| Person: | Walther, Georg; Haberkorn, Otto |
| Company: | Walther (P) und Co., GmbH |
| Internal Links: | |
| Keywords: | |
| Link to the patent office: (without guarantee) |  US2906454 (espacenet), US2906454 (uspto) |
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