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| All Patents in class 74/4 | |||||
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| Number | Date | Patentee | Title | Type | |
| 397,753 | Feb. 12, 1889 | D.S. Regan | Governor for Gas Engines | internal combustion engine governors | |
| 438,209 | Oct. 14, 1890 | A.R. Middleton, C. White | Gas Engine | gas and gasoline engines | |