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| All Patents in class 91/357 | |||||
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| Number | Date | Patentee | Title | Type | |
| 2,016,931 | Oct. 08, 1935 | C.C. Richard | Hydraulic Mechanism for Determining the Path of Movement of a Tool or Other Element | hydraulic apparatus | |
| 2,321,264 | Jun. 08, 1943 | H.H. Turner | Fluid-Pressure Operated Mechanism | oil hydraulic motors | |
| 2,345,563 | Apr. 04, 1944 | R.L. Alcorn, Jr. | Hydraulically operated drop hammer | drop hammers | |
| 2,825,307 | Mar. 04, 1958 | N.V. Gusching, D.B. Enyeart | Hydraulic control system | ||