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Patent:GB133577
| Patent: | GB 133577 |
| Title: | Plane Trigonometry Calculators, Slide Rules |
| Date: | 30.01.1919 |
| Place: | |
| Country: | Great Britain |
| Person: | Windle, E |
| Company: | |
| Internal Links: | Rechenschieber |
| Keywords: | |
| Link to the patent office: (without guarantee) |  GB133577 |
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