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Patent:US1991806
| Patent: | US 1991806 |
| Title: | Calculating machine |
| Date: | 19.02.1935 |
| Place: | Sommerda |
| Country: | USA |
| Person: | Kottmann, August (P) |
| Company: | Rheinmetall (P) |
| Internal Links: | |
| Keywords: | |
| Link to the patent office: (without guarantee) |  US1991806 (espacenet), US1991806 (uspto) |
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