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| All Patents in class 123/90.23 | |||||
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| Number | Date | Patentee | Title | Type | |
| 530,161 | Dec. 04, 1894 | L. Crébessac | Petroleum, Gas or Oil Engine | gas and gasoline engines | |
| 532,980 | Jan. 22, 1895 | F.P. Mill | Gas Engine | gas and gasoline engines | |
| 565,786 | Aug. 11, 1896 | M.F. Bates, R.E. Olds | Gas or Vapor Engine | internal combustion engines | |
| 806,125 | Dec. 05, 1905 | F.O. Farwell | Rotary Explosive Engine | rotary engines | |
| 816,047 | Mar. 27, 1906 | S. Byron, C.M. Smith | Valve Mechanism for Gas Engines | valves | |