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Patent:US930408
| Patent: | US 930408 |
| Title: | Proportion Dividers |
| Date: | 10.08.1909 |
| Place: | |
| Country: | USA |
| Person: | Nelson, L. M. |
| Company: | |
| Internal Links: | Zirkel |
| Keywords: | |
| Link to the patent office: (without guarantee) |  US930408 (espacenet), US930408 (uspto) |
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