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| All Patents in class 251/317 | |||||
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| Number | Date | Patentee | Title | Type | |
| 332,312 | Dec. 15, 1885 | S. Wilcox | Air and Gas Engine | gas and gasoline engines | |
| 1,157,956 | Oct. 26, 1915 | J.L. Osborne | Valve | steam engine governors | |