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Patent:US1827837
| Patent: | US 1827837 |
| Title: | Calculating Machine |
| Date: | 20.10.1931 |
| Place: | |
| Country: | USA |
| Person: | Chase, George Clinton (P) |
| Company: | |
| Internal Links: | |
| Keywords: | |
| Link to the patent office: (without guarantee) |  US1827837 (espacenet), US1827837 (uspto) |
Aus der Patentschrift US1827837