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| All Patents in class 418/200 | |||||
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| Number | Date | Patentee | Title | Type | |
| 218,874 | Aug. 26, 1879 | H. Graf | Rotary Engine | rotary steam engines | |
| 728,263 | May 19, 1903 | J.P. Magney, W.H. Masterman | Rotary Engine | rotary steam engines | |
| 2,028,414 | Jan. 21, 1936 | H. Schneider | Fluid Displacement Device | air compressors | |
| 2,460,310 | Feb. 01, 1949 | G. Rathman | Screw pump | air compressors | |
| 3,100,450 | Aug. 13, 1963 | E.J. Svenson | Hydraulically Actuated Machine Tool | metalworking machine mechanisms | |