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| All Patents in class 251/142 | |||||
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| Number | Date | Patentee | Title | Type | |
| 515,116 | Feb. 20, 1894 | H.M. Crouan | Gas or Petroleum Motor | internal combustion engines | |
| 530,508 | Dec. 11, 1894 | H.T. Dawson | Gas Engine | gas and gasoline engines | |