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Patent:US1423439
| Patent: | US 1423439 |
| Title: | Sector control for tabulating machines |
| Date: | 18.07.1922 |
| Place: | Brooklyn und New York |
| Country: | USA |
| Person: | Lasker, William Walter (P) |
| Company: | Powers Accounting Machine Comp. |
| Internal Links: | |
| Keywords: | |
| Link to the patent office: (without guarantee) |  US1423439 (espacenet), US1423439 (uspto) |
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