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| All Patents in class 418/166 | |||||
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| Number | Date | Patentee | Title | Type | |
| 914,627 | Mar. 09, 1909 | J.S. Alcorn | Rotary engine | rotary steam engines | |
| 2,441,339 | May 11, 1948 | S.A. Rivington | Hydraulic system | ||