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| All Patents in class 418/198 | |||||
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| Number | Date | Patentee | Title | Type | |
| 79,781 | Jul. 07, 1868 | S.P. Ruggles | Improvement in Rotary Fluid-Elevators | rotary pumps | |
| 313,500 | Mar. 10, 1885 | C.F. Jansson | Rotary Engine | rotary steam engines | |