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| All Patents in class 418/230 | |||||
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| Number | Date | Patentee | Title | Type | |
| 6,359 | Apr. 17, 1849 | J. Tremper | Piston-ring and method of deriving motion therefrom in rotary engines | rotary steam engines | |
| 974,913 | Nov. 08, 1910 | J.W. von Pittler | Rotary compressor of the like | air compressors | |