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| All Patents in class 137/625.38 | |||||
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| Number | Date | Patentee | Title | Type | |
| 177,963 | May 30, 1876 | E. Schirck | Governor Valve | steam engine governors | |
| 1,975,250 | Oct. 02, 1934 | O.L. Craft, A.J. Calpha | Hydraulic Feed Control Apparatus | metalworking machines | |
| 2,211,646 | Aug. 13, 1940 | L.A. Cole | Valve | ||