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| All Patents in class 418/36 | |||||
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| Number | Date | Patentee | Title | Type | |
| 150,350 | Apr. 28, 1874 | C.H. Palmer | Rotary Engines | rotary steam engines | |
| 3,829,257 | Aug. 13, 1974 | D.H. Goering | Rotary fluid engine | hot air engines | |