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| All Patents in class 418/12 | |||||
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| Number | Date | Patentee | Title | Type | |
| 447,831 | Mar. 10, 1891 | M. Johnson | Rotary Engine | rotary steam engines | |
| 507,780 | Oct. 31, 1893 | A.F. Brown | Rotary Engine, Pump & Blower | rotary steam engines | |