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| All Patents in class 417/269 | |||||
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| Number | Date | Patentee | Title | Type | |
| 2,138,194 | Nov. 29, 1938 | E.M. Pfauser | Hydraulic Pump | hydraulic pumps | |
| 3,482,521 | Dec. 09, 1969 | M.L. Wolf | Hydraulic Pump with Variable Chamber | hydraulic pumps | |