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Patent:DE253859
| Patent: | DE 253859 |
| Title: | Rechenmaschine |
| Date: | 18.11.1912 |
| Place: | Sasznitz |
| Country: | Germany |
| Person: | Hermann Proetel |
| Company: | |
| Internal Links: | |
| Keywords: | |
| Link to the patent office: (without guarantee) |  DE253859 |
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