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| All Patents in class 123/74R | |||||
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| Picture | Number | Date | Patentee | Title | |
| 535,815 | Mar. 19, 1895 | E.E. Pierce, W.L. Crouch | Gas Engine | ||
| 591,952 | Oct. 19, 1897 | J.C. Hilton, C.I. Cummings | Explosive Engine | ||
| 612,047 | Oct. 11, 1898 | L.H. Millen | Gas Engine | ||
 | 626,155 | May 30, 1899 | E.J. Fithian | Gas Engine and Means for Governing the Same | |
 | 1,349,630 | Aug. 17, 1920 | C.H. Sheasley | Starting Port for Valveless Two-Cycle Internal Combustion Engines | |