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| All Patents in class 418/223 | |||||
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| Number | Date | Patentee | Title | Type | |
| 465,519 | Dec. 22, 1891 | S.G. Brosius | Rotary Engine | rotary engines | |
| 655,093 | Jul. 31, 1900 | V.F. Lake | Rotary Motor | rotary steam engines | |