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Patent:CA135580
| Patent: | CA 135580 |
| Title: | Calculating machine |
| Date: | 12.09.1911 |
| Place: | |
| Country: | Canada |
| Person: | Rein, Robert (P) |
| Company: | |
| Internal Links: | |
| Keywords: | |
| Link to the patent office: (without guarantee) |  CA135580 |
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