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Patent:US1213100
| Patent: | US 1213100 |
| Title: | Combined type-writing and computing machine |
| Date: | 16.01.1917 |
| Place: | Hartford, CT und New York |
| Country: | USA |
| Person: | Hart, Frederick (P) |
| Company: | Underwood (P) Computing Machine Comp. |
| Internal Links: | |
| Keywords: | |
| Link to the patent office: (without guarantee) |  US1213100 (espacenet), US1213100 (uspto) |
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