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| All Patents in class 137/625.65 | |||||
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| Picture | Number | Date | Patentee | Title | |
| 2,494,491 | Jan. 10, 1950 | O.E. Rosaen | Ironclad Electromagnet with Pivoted Armature | ||
| 2,600,746 | Jun. 17, 1952 | W. Ernst | Fluid Pressure Control Valve | ||
| 2,916,018 | Dec. 08, 1959 | A.C. Nolte, C.F. Pabst | Control Mechanism | ||
| 3,414,019 | Dec. 03, 1968 | N.V. Gusching | Electro-fluid control system | ||
| 4,790,233 | Dec. 13, 1988 | L.W. Durham, B.S. Backe | Method and Apparatus for Controlling Hydraulic Systems | ||