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Patent:US1081310
| Patent: | US 1081310 |
| Title: | Calculating Machine |
| Date: | 16.12.1913 |
| Place: | |
| Country: | USA |
| Person: | Jahnz, Erwin (P) |
| Company: | Madas (P) |
| Internal Links: | |
| Keywords: | |
| Link to the patent office: (without guarantee) |  US1081310 (espacenet), US1081310 (uspto) |
Aus der Patentschrift US1081310