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| All Patents in class 123/58.6 | |||||
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| Number | Date | Patentee | Title | Type | |
| 371,793 | Oct. 18, 1887 | C. Beckfeld, A. Schmid | Gas Engine | gas and gasoline engines | |
| 658,595 | Sep. 25, 1900 | W.E. Simpson | Internal-Combustion Motor | internal combustion engines | |
| 680,907 | Aug. 20, 1901 | A.F. Bardwell | Multiple Cylinder Explosive Engine | gas and gasoline engines | |
| 1,292,942 | Jan. 28, 1919 | J.F. Woolf, E.J. Woolf | Internal-Combustion Engine. | internal combustion engines | |
| 1,429,818 | Sep. 19, 1922 | J.F. Woolf, E.J. Woolf | Gas Engine | carburetors | |