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Patent:US513172
| Patent: | US 513172 |
| Title: | Logarithmic Calculator |
| Date: | 23.01.1894 |
| Place: | |
| Country: | USA |
| Person: | Billeter, Julius (P) |
| Company: | |
| Internal Links: | Rechenwalze |
| Keywords: | |
| Link to the patent office: (without guarantee) |  US513172 (espacenet), US513172 (uspto) |
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Aus der Patentschrift US513172