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Patent:US1413713
| Patent: | US 1413713 |
| Title: | Zero-setting device for calculating machines |
| Date: | 25.04.1922 |
| Place: | Lehighton, PA |
| Country: | USA |
| Person: | Hugo Enders |
| Company: | Lehigh Corp. |
| Internal Links: | |
| Keywords: | |
| Link to the patent office: (without guarantee) |  US1413713 (espacenet), US1413713 (uspto) |
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