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| All Patents in class 123/25D | |||||
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| Number | Date | Patentee | Title | Type | |
| 291,102 | Jan. 01, 1884 | J. Spiel | Gas Motor | gas and gasoline engines | |
| 548,142 | Oct. 15, 1895 | H. Schumm | Apparatus for Working Gas or Oil Engines | gas and gasoline engines | |
| 597,860 | Jan. 25, 1898 | S. Rolfe | Explosion Engine | oil engines | |
| 861,411 | Jul. 30, 1907 | C.W. Weiss | Internal Combustion Engine | oil engines | |