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| All Patents in class 137/625.64 | |||||
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| Picture | Number | Date | Patentee | Title | |
 | 2,363,111 | Nov. 21, 1944 | R.D. Bennett | Hydraulic valve | |
| 2,634,086 | Apr. 07, 1953 | W.E. Johns | Valve with self-contained stem centering device | ||
| 2,994,304 | Aug. 01, 1961 | W. Shultz | Hydraulic Servo Drive System for Machine Tool Elements and the Like | ||
| 4,790,233 | Dec. 13, 1988 | L.W. Durham, B.S. Backe | Method and Apparatus for Controlling Hydraulic Systems | ||