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| All Patents in class 418/115 | |||||
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| Number | Date | Patentee | Title | Type | |
| 444,834 | Jan. 20, 1891 | J.W. Hayes | Rotary Engine | rotary steam engines | |
| 1,093,796 | Apr. 21, 1914 | C. Miller | Rotary Engine | rotary steam engines | |