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Patent:GB189900692
| Patent: | GB 189900692 |
| Title: | A New or Improved Abacus or Device for use in Calculating and for like Purposes |
| Date: | 18.02.1899 |
| Place: | Clapham |
| Country: | Great Britain |
| Person: | George Bower Froom |
| Company: | |
| Internal Links: | |
| Keywords: | |
| Link to the patent office: (without guarantee) |  GB189900692 |
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