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Patent:US1790569
| Patent: | US 1790569 |
| Title: | Slide Rule |
| Date: | 27.01.1931 |
| Place: | |
| Country: | USA |
| Person: | J. Asper |
| Company: | |
| Internal Links: | Rechenschieber |
| Keywords: | |
| Link to the patent office: (without guarantee) |  US1790569 (espacenet), US1790569 (uspto) |
Aus der Patentschrift US1790569