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| All Patents in class 418/232 | |||||
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| Number | Date | Patentee | Title | Type | |
| 40,278 | Oct. 13, 1863 | A. Ramsdell | Rotary Steam Engine | rotary steam engines | |
| 441,865 | Dec. 02, 1890 | G.H. Chappell | Rotary Gas Engine | rotary engines | |