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| All Patents in class 137/115.13 | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,916,433 | Jul. 04, 1933 | W.C. Muller | Speed Control Valve | hydraulic apparatus | |
| 2,143,229 | Jan. 10, 1939 | P.S. Russel | Control Device | industrial control apparatus | |
| 2,614,580 | Oct. 21, 1952 | G.A. Cormier | Unloading Valve | hydraulic apparatus | |