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Patent:US2553653
| Patent: | US 2553653 |
| Title: | Time calculator |
| Date: | 22.05.1951 |
| Place: | |
| Country: | USA |
| Person: | Graham William D |
| Company: | |
| Internal Links: | |
| Keywords: | |
| Link to the patent office: (without guarantee) |  US2553653 (espacenet), US2553653 (uspto) |
Aus der Patentschrift US2553653
- DATUM: 22.05.1951
- TITEL: Time calculator