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Patent:US2533580
| Patent: | US 2533580 |
| Title: | Calculator |
| Date: | 12.12.1950 |
| Place: | |
| Country: | USA |
| Person: | Hall, E. F. (P) |
| Company: | |
| Internal Links: | |
| Keywords: | |
| Link to the patent office: (without guarantee) |  US2533580 (espacenet), US2533580 (uspto) |
Aus der Patentschrift US2533580
- DATUM: 12.12.1950
- TITEL: Calculator