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Patent:US2646631
| Patent: | US 2646631 |
| Title: | Combined Abacus and Counting Rack |
| Date: | 28.07.1953 |
| Place: | |
| Country: | USA |
| Person: | Lazar, N. (P) |
| Company: | |
| Internal Links: | Kugelrechner |
| Keywords: | |
| Link to the patent office: (without guarantee) |  US2646631 (espacenet), US2646631 (uspto) |
Aus der Patentschrift US2646631
- DATUM: 28.07.1953
- TITEL: Combined abacus and counting rack