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Patent:US1994639
| Patent: | US 1994639 |
| Title: | Column register for calculating |
| Date: | 19.03.1935 |
| Place: | Harrisburg, PA und New York |
| Country: | USA |
| Person: | Foothorap, Harry Arthur (P) |
| Company: | Underwood Elliott-Fisher (P) Comp. |
| Internal Links: | |
| Keywords: | |
| Link to the patent office: (without guarantee) |  US1994639 (espacenet), US1994639 (uspto) |
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