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Patent:US1439936
| Patent: | US 1439936 |
| Title: | Calculator |
| Date: | 26.12.1922 |
| Place: | |
| Country: | USA |
| Person: | W. L. Wyckoff |
| Company: | |
| Internal Links: | |
| Keywords: | |
| Link to the patent office: (without guarantee) |  US1439936 (espacenet), US1439936 (uspto) |
Aus der Patentschrift US1439936
- DATUM: 26.12.1922
- TITEL: Calculator