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| All Patents in class 418/97 | |||||
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| Number | Date | Patentee | Title | Type | |
| 24,388 | Jun. 14, 1859 | D.D. Hardy | Rotary Steam Engine | rotary steam engines | |
| 683,614 | Oct. 01, 1901 | C.R. Meston | Air-compressor | air compressors | |
| 958,345 | May 17, 1910 | J.T. Wilkin | Vacuum-pump | vacuum pumps | |
| 1,199,229 | Sep. 26, 1916 | B.F. Augustine | Rotary Explosion Engine | rotary engines | |