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| All Patents in class 123/19 | |||||
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| Number | Date | Patentee | Title | Type | |
| 41,299 | Jan. 19, 1864 | P. Hugon | Gas Engine | gas and gasoline engines | |
| 44,572 | Oct. 04, 1864 | S.L. Wiegand | Gas Engine | gas and gasoline engines | |
| 192,206 | Jun. 19, 1877 | J. Wertheim | Atmospheric Gas Engine | gas and gasoline engines | |
| 575,720 | Jan. 26, 1897 | J. Ledent | Gas Engine | cooling apparatus | |