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Patent:US811205
| Patent: | US 811205 |
| Title: | Adding Device |
| Date: | 30.01.1906 |
| Place: | |
| Country: | USA |
| Person: | Dilworth, Edward C. (P) |
| Company: | |
| Internal Links: | Dilworth Adder, Zahlenschieber |
| Keywords: | |
| Link to the patent office: (without guarantee) |  US811205 (espacenet), US811205 (uspto) |
Aus der Patentschrift US811205
Dilworth Adder aus: The Business Man's Magazine, Oct. 1904