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| All Patents in class 418/71 | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,238,870 | Sep. 04, 1917 | B.F. Augustine | Rotary Engine | rotary steam engines | |
| 3,011,449 | Dec. 05, 1961 | W. Ernst | Vaned Hydraulic Unit | hydraulic apparatus | |