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| All Patents in class 60/39.08 | |||||
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| Number | Date | Patentee | Title | Type | |
| 33,799 | Nov. 26, 1861 | P. Shaw | Air Engine | hot air engines | |
| 550,742 | Dec. 03, 1895 | W.R. Campbell | Rotary Gas Engine | rotary engines | |
| 660,129 | Oct. 23, 1900 | P.H. Standish | Rotary Explosive-Motor | rotary engines | |