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Patent:US1890776
| Patent: | US 1890776 |
| Title: | Calculating Machine |
| Date: | 13.12.1932 |
| Place: | |
| Country: | USA |
| Person: | Friden, Carl Mauritz Fredrick (P) |
| Company: | Marchant (P) |
| Internal Links: | |
| Keywords: | |
| Link to the patent office: (without guarantee) |  US1890776 (espacenet), US1890776 (uspto) |
Aus der Patentschrift US1890776