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| All Patents in class 137/538 | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,702,550 | Feb. 19, 1929 | F.E. Stevenson | Hydraulic Reducing Valve | hydraulic valves | |
| 2,522,783 | Sep. 19, 1950 | J.P. Golden | Hydraulic Pump and Circuit | hydraulic pumps | |