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| All Patents in class 123/25Q | |||||
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| Number | Date | Patentee | Title | Type | |
| 542,846 | Jul. 16, 1895 | R. Diesel | Method and Apparatus for Converting Heat to Work | diesel engines | |
| 597,860 | Jan. 25, 1898 | S. Rolfe | Explosion Engine | oil engines | |
| 607,580 | Jul. 19, 1898 | L.J. Wing | Gas Engine | gas and gasoline engines | |
| 610,004 | Aug. 30, 1898 | A.H. Dingman | Gas Engine | gas and gasoline engines | |