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Patent:US1936998
| Patent: | US 1936998 |
| Title: | Calculating Device |
| Date: | 28.11.1933 |
| Place: | |
| Country: | USA |
| Person: | J. F. Summers |
| Company: | |
| Internal Links: | |
| Keywords: | |
| Link to the patent office: (without guarantee) |  US1936998 (espacenet), US1936998 (uspto) |
Aus der Patentschrift US1936998
- DATUM: 28.11.1933
- TITEL: Calculating device