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| All Patents in class 91/492 | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,876,833 | Sep. 13, 1932 | E. Benedek | Pump | hydraulic pumps | |
| 2,006,880 | Jul. 02, 1935 | E.K. Benedek | High Pressure Radial Piston Hydraulic Pump or Motor | hydraulic pumps | |