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| All Patents in class 417/532 | |||||
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| Number | Date | Patentee | Title | Type | |
| 9,545X | Mar. 30, 1836 | N. Chapin | Forcing pump | pumps | |
| 52,431 | Feb. 06, 1866 | S.G. Mason, C.B. Gill | Improvement in pumps | ||
| 2,579,879 | Dec. 25, 1951 | B.H. Mosbacher, L.T. Stoyke | Gyratory valve for hydraulic pumps or motors | ||