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| All Patents in class 91/485 | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,621,495 | Mar. 22, 1927 | C.M. Conradson | Rotary Pump | rotary pumps | |
| 2,397,314 | Mar. 26, 1946 | C.E. Grosser | Pump or motor unit | hydraulic pumps | |
| 2,579,879 | Dec. 25, 1951 | B.H. Mosbacher, L.T. Stoyke | Gyratory valve for hydraulic pumps or motors | ||