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| All Patents in class 123/43B | |||||
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| Number | Date | Patentee | Title | Type | |
| 150,350 | Apr. 28, 1874 | C.H. Palmer | Rotary Engines | rotary steam engines | |
| 1,456,232 | May 22, 1923 | A.E. Greene | Rotary engine | rotary engines | |