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| All Patents in class 60/39.281 | |||||
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| Number | Date | Patentee | Title | Type | |
| 460,070 | Sep. 22, 1891 | J.T. Hobbs, D.D. Hobbs | Rotary Gas Engine | rotary engines | |
| 547,414 | Oct. 08, 1895 | J.J. Boardman | Gas Engine | gas and gasoline engines | |
| 611,813 | Oct. 04, 1898 | G.A. Marconnett | Thermal Expansion Engine | gas and gasoline engines | |