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| All Patents in class 137/625.6 | |||||
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| Number | Date | Patentee | Title | Type | |
| 2,526,361 | Oct. 17, 1950 | C. Johnson | Control valve for fluid servomotors | milling machine accessories | |
| 2,618,244 | Nov. 18, 1952 | E.G. Roehm | Pilot Valve Controlled Tracer Valve | hydraulic apparatus | |
| 2,851,996 | Sep. 16, 1958 | W.S. Bunnell | Hydraulic Control Valve for Machine Tools | hydraulic apparatus | |
| 3,555,966 | Jan. 19, 1971 | I.J. Coniglio | Air cylinder with pilot valve in head | ||