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| All Patents in class 418/249 | |||||
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| Number | Date | Patentee | Title | Type | |
| 684,471 | Oct. 15, 1901 | L.O. Stevens | Rotary engine | rotary engines | |
| 855,028 | May 28, 1907 | J.C. Walker | Rotary Engine | rotary steam engines | |
| 974,913 | Nov. 08, 1910 | J.W. von Pittler | Rotary compressor of the like | air compressors | |
| 2,492,687 | Dec. 27, 1949 | A.H. Dall | Hydraulic Pump | hydraulic apparatus | |