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| All Patents in class 123/18A | |||||
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| Number | Date | Patentee | Title | Type | |
| 374,968 | Dec. 20, 1887 | B.F. Kadel | Gas or Gasoline Engine | gas and gasoline engines | |
| 623,361 | Apr. 18, 1899 | J.H. Frew | Oscillating Gas or Steam Engine | gas and gasoline engines | |