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Patent:US2722376
| Patent: | US 2722376 |
| Title: | Back Transfer Calculating Machine |
| Date: | 01.11.1955 |
| Place: | |
| Country: | USA |
| Person: | Ellerbeck, Grant Clawson (P) |
| Company: | Friden (P) |
| Internal Links: | Rückübertragung |
| Keywords: | |
| Link to the patent office: (without guarantee) |  US2722376 (espacenet), US2722376 (uspto) |
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