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Patent:US1441323
| Patent: | US 1441323 |
| Title: | Abacus Frame |
| Date: | 09.01.1923 |
| Place: | |
| Country: | USA |
| Person: | A. J. Barber |
| Company: | |
| Internal Links: | Kugelrechner |
| Keywords: | |
| Link to the patent office: (without guarantee) |  US1441323 (espacenet), US1441323 (uspto) |
Aus der Patentschrift US1441323
- DATUM: 09.01.1923
- TITEL: Abacus frame