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| All Patents in class 418/26 | |||||
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| Number | Date | Patentee | Title | Type | |
| 2,233,551 | Mar. 04, 1941 | R.W. Ott | Fluid pump | hydraulic pumps | |
| 2,612,114 | Sep. 30, 1952 | W. Ernst | Vane Pump or Motor | hydraulic apparatus | |
| 2,921,439 | Jan. 19, 1960 | F.G. Krafft | Pump Control | hydraulic apparatus | |
| 2,985,109 | May 23, 1961 | W. Ernst | Hydraulic Pump | hydraulic apparatus | |
| 3,015,212 | Jan. 02, 1962 | W. Ernst, F.G. Krafft | Pump Control | hydraulic apparatus | |