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| All Patents in class 418/13 | |||||
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| Number | Date | Patentee | Title | Type | |
| 444,087 | Jan. 06, 1891 | S.E. Chapleau | Rotary Compound Steam Engine | rotary steam engines | |
| 597,585 | Jan. 18, 1898 | H.J. McLoed | Rotary Engine | rotary steam engines | |
| 935,343 | Sep. 28, 1909 | G. Westinghouse | Rotary Engine | rotary steam engines | |