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| All Patents in class 60/421 | |||||
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| Picture | Number | Date | Patentee | Title | |
| 2,522,783 | Sep. 19, 1950 | J.P. Golden | Hydraulic Pump and Circuit | ||
| 2,573,098 | Oct. 30, 1951 | H. Ernst, A.H. Dall | Hydraulic Feed Mechanism | ||
| 4,170,124 | Oct. 09, 1979 | R. MacGregor | Hydraulic control system for press brakes and the like | ||
 | 4,706,456 | Nov. 17, 1987 | L.W. Durham, B.S. Backe | Method and Apparatus for Controlling Hydraulic Systems | |