Patent:US2575555
Patent: | US 2575555 |
Title: | Perpetual calendar |
Date: | 20.11.1951 |
Place: | Phoenix, AZ |
Country: | USA |
Person: | La Plante, Paul W. |
Company: | |
Internal Links: | |
Keywords: | |
Link to the patent office: (without guarantee) | ![]() ![]() |
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