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| All Patents in class 60/39.15 | |||||
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| Picture | Number | Date | Patentee | Title | |
 | 213,783 | Apr. 01, 1879 | H.W. Sherrill | Hot-Air Engine | |
| 384,673 | Jun. 19, 1888 | R. Boeklen | Gas Motor | ||
| 642,949 | Feb. 06, 1900 | P.B. Verity, J.L. Baillie | Combustion Engine | ||
| 1,395,995 | Nov. 01, 1921 | J.W. George | Rotary Internal Combustion Engine | ||