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Patent:GB1136283
| Patent: | GB 1136283 |
| Title: | Calculators |
| Date: | 11.12.1968 |
| Place: | London |
| Country: | Great Britain |
| Person: | Norman Herbert Wetherill Sydney Blott |
| Company: | British Railways Board |
| Internal Links: | |
| Keywords: | |
| Link to the patent office: (without guarantee) |  GB1136283 |
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