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| All Patents in class 418/136 | |||||
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| Number | Date | Patentee | Title | Type | |
| 924,832 | Jun. 15, 1909 | R.W. Riordan | Rotary Engine | rotary steam engines | |
| 4,898,524 | Feb. 06, 1990 | J.K. Butzen | Fluid Driven Rotary Motor | ||