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Patent:US2158553
| Patent: | US 2158553 |
| Title: | Mechanical Calendar |
| Date: | 16.05.1939 |
| Place: | |
| Country: | USA |
| Person: | G. D. Rogers |
| Company: | |
| Internal Links: | Datumsrechner |
| Keywords: | |
| Link to the patent office: (without guarantee) |  US2158553 (espacenet), US2158553 (uspto) |
Aus der Patentschrift US2158553