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| Patents for James Robson | |||||
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| Picture | Number | Date | Patentee | Title | |
| 220,174 | Sep. 30, 1879 | J. Robson | Gas-Engine | ||
| GB-187,904,501 | Nov. 04, 1879 | J. Robson | Gas Engine | ||
| 243,795 | Jul. 05, 1881 | J. Robson | Gas Engine | ||
 | 278,600 | May 29, 1883 | J. Robson | Gas Engine | |