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| All Patents in class 418/185 | |||||
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| Picture | Number | Date | Patentee | Title | |
| 2,236 | Sep. 04, 1841 | S.A. Lee | Rotary Pump | ||
| 1,859,618 | May 24, 1932 | W.W. Cleland | Rotary Internal Combustion Engine | ||
| 2,492,687 | Dec. 27, 1949 | A.H. Dall | Hydraulic Pump | ||