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Patent:US2273857
| Patent: | US 2273857 |
| Title: | Calculating Machine |
| Date: | 24.02.1942 |
| Place: | |
| Country: | USA |
| Person: | Friden, Carl Mauritz Fredrick (P) |
| Company: | Friden (P) |
| Internal Links: | |
| Keywords: | |
| Link to the patent office: (without guarantee) |  US2273857 (espacenet), US2273857 (uspto) |
Aus der Patentschrift US2273857