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| All Patents in class 91/336 | |||||
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| Number | Date | Patentee | Title | Type | |
| 664,801 | Dec. 25, 1900 | W.D. Williams | Rotary Engine | rotary steam engines | |
| 1,927,524 | Sep. 19, 1933 | H.G. Mueller | Steam Engine Inlet Valve Gear | steam engine valve gear | |