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| All Patents in class 123/41.2 | |||||
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| Number | Date | Patentee | Title | Type | |
| 347,469 | Aug. 17, 1886 | J.H. Clark | Gas Engine | gas and gasoline engines | |
| 572,209 | Dec. 01, 1896 | E.E. Ludl | Explosive Engine | ||
| 865,677 | Sep. 10, 1907 | J.W. Burkett | Gas-engine | gas and gasoline engines | |
| 921,035 | May 11, 1909 | C.W. Weiss | Internal Combustion Engine | oil engines | |
| 1,843,162 | Feb. 02, 1932 | A.C. Boock, C.B. Jahnke | Power Plant | power plants | |