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Patent:US1699540
| Patent: | US 1699540 |
| Title: | Adding machine |
| Date: | 22.01.1929 |
| Place: | Detroit |
| Country: | USA |
| Person: | John Magnus |
| Company: | Burroughs (P) Adding Machine Comp. |
| Internal Links: | |
| Keywords: | |
| Link to the patent office: (without guarantee) |  US1699540 (espacenet), US1699540 (uspto) |
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