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Patent:US3021058
| Patent: | US 3021058 |
| Title: | Mathematical instruments |
| Date: | 13.02.1962 |
| Place: | Knoxville, TN |
| Country: | USA |
| Person: | Joseph R. Horton |
| Company: | |
| Internal Links: | |
| Keywords: | |
| Link to the patent office: (without guarantee) |  US3021058 (espacenet), US3021058 (uspto) |
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