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Patent:US3019973
| Patent: | US 3019973 |
| Title: | Slide Rule |
| Date: | 06.02.1962 |
| Place: | |
| Country: | USA |
| Person: | C. H. Blackerby |
| Company: | |
| Internal Links: | Rechenschieber |
| Keywords: | |
| Link to the patent office: (without guarantee) |  US3019973 (espacenet), US3019973 (uspto) |
Aus der Patentschrift US3019973
- DATUM: 06.02.1962
- TITEL: Slide rule