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Patent:US773669
| Patent: | US 773669 |
| Title: | Perpetual Calendar |
| Date: | 05.05.1904 |
| Place: | San Jose |
| Country: | USA |
| Person: | OSchaugnessy, Thomas (P) |
| Company: | |
| Internal Links: | Datumsrechner |
| Keywords: | |
| Link to the patent office: (without guarantee) |  US773669 (espacenet), US773669 (uspto) |
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