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Patent:US1174689
| Patent: | US 1174689 |
| Title: | Appliance for teaching arithmetical fractions |
| Date: | 07.03.1916 |
| Place: | New York |
| Country: | USA |
| Person: | Frank J. Coleman |
| Company: | |
| Internal Links: | |
| Keywords: | |
| Link to the patent office: (without guarantee) |  US1174689 (espacenet), US1174689 (uspto) |
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