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| All Patents in class 137/625.66 | |||||
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| Number | Date | Patentee | Title | Type | |
| 257,530 | May 09, 1882 | B.F. Sturtevant | Steam Slide Valve | steam engine valves | |
| 503,975 | Aug. 29, 1893 | E.S. Matthews | Hydraulic valve-gear | ||
| 2,388,832 | Nov. 13, 1945 | W.W. Criley | Control Mechanism | machine tool controls | |
| 2,526,361 | Oct. 17, 1950 | C. Johnson | Control valve for fluid servomotors | milling machine accessories | |