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| All Patents in class 60/39.38 | |||||
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| Number | Date | Patentee | Title | Type | |
| 550,742 | Dec. 03, 1895 | W.R. Campbell | Rotary Gas Engine | rotary engines | |
| 1,395,995 | Nov. 01, 1921 | J.W. George | Rotary Internal Combustion Engine | rotary engines | |