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Patent:GB142212
| Patent: | GB 142212 |
| Title: | Abacuses |
| Date: | 12.02.1919 |
| Place: | |
| Country: | Great Britain |
| Person: | Clauson, A. E. |
| Company: | |
| Internal Links: | Kugelrechner |
| Keywords: | |
| Link to the patent office: (without guarantee) |  GB142212 |
Aus der Patentschrift GB142212