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Patent:US2933813
| Patent: | US 2933813 |
| Title: | Ellipsographs |
| Date: | 26.04.1960 |
| Place: | |
| Country: | USA |
| Person: | A. V. T. Day |
| Company: | |
| Internal Links: | Ellipsograph |
| Keywords: | |
| Link to the patent office: (without guarantee) |  US2933813 (espacenet), US2933813 (uspto) |
Aus der Patentschrift US2933813
- DATUM: 26.04.1960
- TITEL: Ellipsographs