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| All Patents of Type: hydraulic valves | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,693,109 | Nov. 27, 1928 | W. Ernst | Semiautomatic Valve | hydraulic valves | |
| 1,702,550 | Feb. 19, 1929 | F.E. Stevenson | Hydraulic Reducing Valve | hydraulic valves | |
| 2,496,040 | Jan. 31, 1950 | W.W. Criley | Control Valve Mechanism for Clutches and Brakes | hydraulic valves | |