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Patent:GB322047
| Patent: | GB 322047 |
| Title: | Improvements in calculating machines |
| Date: | 28.11.1929 |
| Place: | Kusnacht, Zurich |
| Country: | Great Britain |
| Person: | Rolf Cyril Hofer |
| Company: | |
| Internal Links: | |
| Keywords: | |
| Link to the patent office: (without guarantee) |  GB322047 |
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