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Patent:CH137789
| Patent: | CH 137789 |
| Title: | Zehnerübertrag für planetenartig schwenkbare Rechenwerke |
| Date: | 15.12.1928 |
| Place: | Berlin-Wannsee |
| Country: | Switzerland |
| Person: | Bergmann, Jean (P) |
| Company: | |
| Internal Links: | Zehnerübertrag |
| Keywords: | |
| Link to the patent office: (without guarantee) |  CH137789 |
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