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Patent:US2232319
| Patent: | US 2232319 |
| Title: | Stadia Protractor |
| Date: | 18.02.1941 |
| Place: | |
| Country: | USA |
| Person: | E. E. Gray |
| Company: | |
| Internal Links: | |
| Keywords: | |
| Link to the patent office: (without guarantee) |  US2232319 (espacenet), US2232319 (uspto) |
Aus der Patentschrift US2232319