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| All Patents in class 418/77 | |||||
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| Picture | Number | Date | Patentee | Title | |
 | 251,733 | Jan. 03, 1882 | W.C. Pooley | Rotary engine | |
 | 347,242 | Aug. 10, 1886 | J. Hills | Rotary Steam Engine | |
| 2,492,687 | Dec. 27, 1949 | A.H. Dall | Hydraulic Pump | ||