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| All Patents in class 123/39 | |||||
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| Number | Date | Patentee | Title | Type | |
| 391,486 | Oct. 23, 1888 | W.S. Sharpneck | Gas Engine | gas and gasoline engines | |
| 399,908 | Mar. 19, 1889 | S. Lawson | Gas Engine | gas and gasoline engines | |
| 577,567 | Feb. 23, 1897 | L.H. Wattles | Gas Engine | gas and gasoline engines | |
| 588,062 | Aug. 10, 1897 | H.C. Hart | Gas Engine | gas and gasoline engines | |
| 645,293 | Mar. 13, 1900 | A. Heil | Gas Engine | ||
| 662,181 | Nov. 20, 1900 | J. Beattie, Jr., G.J. Altham | Gas Engine | gas and gasoline engines | |