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Patent:US1406863
| Patent: | US 1406863 |
| Title: | Drawing Instrument |
| Date: | 14.02.1922 |
| Place: | |
| Country: | USA |
| Person: | S. Hoffman, J. Schwartz, and I. Holden |
| Company: | |
| Internal Links: | |
| Keywords: | |
| Link to the patent office: (without guarantee) |  US1406863 (espacenet), US1406863 (uspto) |
Aus der Patentschrift US1406863
- DATUM: 14.02.1922
- TITEL: Drawing instrument