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Patent:US1380754
| Patent: | US 1380754 |
| Title: | Integraph and Differentiator |
| Date: | 07.06.1921 |
| Place: | |
| Country: | USA |
| Person: | J. P. Van Bogaert |
| Company: | |
| Internal Links: | Planimeter, Integraph |
| Keywords: | |
| Link to the patent office: (without guarantee) |  US1380754 (espacenet), US1380754 (uspto) |
Aus der Patentschrift US1380754
- DATUM: 07.06.1921
- TITEL: Integraph and differentiator