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| All Patents in class 418/131 | |||||
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| Number | Date | Patentee | Title | Type | |
| 465,907 | Dec. 29, 1891 | W.N. Whipple | Rotary Steam Engine | rotary steam engines | |
| 5,417,555 | May 23, 1995 | W.G. Kuban, I.E. Wolfe, D.J. Luoma | Rotary vane machine having end seal plates | air pumps | |