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| All Patents in class 418/235 | |||||
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| Number | Date | Patentee | Title | Type | |
| 984,904 | Feb. 21, 1911 | A.E. Greene | Rotary engine | rotary engines | |
| 1,199,229 | Sep. 26, 1916 | B.F. Augustine | Rotary Explosion Engine | rotary engines | |
| 1,859,618 | May 24, 1932 | W.W. Cleland | Rotary Internal Combustion Engine | rotary engines | |