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Patent:US1840378
| Patent: | US 1840378 |
| Title: | Calculating Machine |
| Date: | 12.01.1932 |
| Place: | |
| Country: | USA |
| Person: | C. Wittenmyer |
| Company: | Felt und Tarrant (P) |
| Internal Links: | Comptometer |
| Keywords: | |
| Link to the patent office: (without guarantee) |  US1840378 (espacenet), US1840378 (uspto) |
Aus der Patentschrift US1840378