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Patent:US2289717
| Patent: | US 2289717 |
| Title: | Slide Rule for the Sightless |
| Date: | 14.07.1942 |
| Place: | |
| Country: | USA |
| Person: | R. Montgomery |
| Company: | |
| Internal Links: | Rechenschieber |
| Keywords: | |
| Link to the patent office: (without guarantee) |  US2289717 (espacenet), US2289717 (uspto) |
Aus der Patentschrift US2289717
- DATUM: 14.07.1942
- TITEL: Slide rule for the sightless