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Patent:US1411541
| Patent: | US 1411541 |
| Title: | Slide Rule |
| Date: | 04.04.1922 |
| Place: | |
| Country: | USA |
| Person: | Min-Kao Tang |
| Company: | |
| Internal Links: | Rechenschieber |
| Keywords: | |
| Link to the patent office: (without guarantee) |  US1411541 (espacenet), US1411541 (uspto) |
Aus der Patentschrift US1411541
- DATUM: 04.04.1922
- TITEL: Slide rule