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Patent:GB1311688
| Patent: | GB 1311688 |
| Title: | IMPROVEMENTS IN AND RELATING TO CALCULATING MACHINES |
| Date: | 29.07.1870 |
| Place: | San Gabriel, Cal. USA |
| Country: | Great Britain |
| Person: | Mark, Richard S. (P) |
| Company: | Addmaster (P) Corporation |
| Internal Links: | |
| Keywords: | |
| Link to the patent office: (without guarantee) |  GB1311688 |
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