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Patent:GB343475
| Patent: | GB 343475 |
| Title: | Improvements in and relating to calculating machines |
| Date: | 16.02.1931 |
| Place: | Wallington, Surrey und London und London |
| Country: | Great Britain |
| Person: | Ball, William (P) Frederick Huntley Donald Petrie Simson |
| Company: | |
| Internal Links: | |
| Keywords: | |
| Link to the patent office: (without guarantee) |  GB343475 |
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