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Patent:US1028344
| Patent: | US 1028344 |
| Title: | Calculating Machine |
| Date: | 04.06.1912 |
| Place: | |
| Country: | USA |
| Person: | Felt, Dorr E. (P) |
| Company: | |
| Internal Links: | |
| Keywords: | |
| Link to the patent office: (without guarantee) |  US1028344 (espacenet), US1028344 (uspto) |
Aus der Patentschrift US1028344