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Patent:US1992366
| Patent: | US 1992366 |
| Title: | Arithmetic teaching device |
| Date: | 26.02.1935 |
| Place: | Strathmore, CA |
| Country: | USA |
| Person: | Joseph B. Fisher |
| Company: | |
| Internal Links: | |
| Keywords: | |
| Link to the patent office: (without guarantee) |  US1992366 (espacenet), US1992366 (uspto) |
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