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| All Patents in class 123/225 | |||||
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| Number | Date | Patentee | Title | Type | |
| 442,963 | Dec. 16, 1890 | J.H. Eichler | Rotary Gas Engine | rotary engines | |
| 660,482 | Oct. 23, 1900 | F.G. Bates | Rotary Explosive-Engine | rotary engines | |