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Patent:US1757669
| Patent: | US 1757669 |
| Title: | Flexible handle connection for calculating machines |
| Date: | 06.05.1930 |
| Place: | Lake Bluff, IL |
| Country: | USA |
| Person: | Johantgen, Oliver David (P) |
| Company: | Victor (P) Adding Machine Co. |
| Internal Links: | |
| Keywords: | |
| Link to the patent office: (without guarantee) |  US1757669 (espacenet), US1757669 (uspto) |
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