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| All Patents in class 123/90.28 | |||||
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| Number | Date | Patentee | Title | Type | |
| 418,821 | Jan. 07, 1890 | J.D. Smith | Gas Engine | gas and gasoline engines | |
| 1,569,887 | Jan. 19, 1926 | C.E. Sargent | Poppet Valve Rotator | internal combustion engine valves | |