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Patent:US1657872
| Patent: | US 1657872 |
| Title: | Combined Calendar Calculator and Chart |
| Date: | 31.01.1928 |
| Place: | |
| Country: | USA |
| Person: | C. E. Turnquist |
| Company: | |
| Internal Links: | Datumsrechner |
| Keywords: | |
| Link to the patent office: (without guarantee) |  US1657872 (espacenet), US1657872 (uspto) |
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