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| All Patents in class 91/306 | |||||
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| Number | Date | Patentee | Title | Type | |
| 2,296,647 | Dec. 15, 1936 | J.H. McCormick | Hydraulic Pressure Booster | hydraulic pump controls | |
| 3,440,933 | Apr. 29, 1969 | D.E. Sutton | Adjustable stroke control device | ||
| 3,555,966 | Jan. 19, 1971 | I.J. Coniglio | Air cylinder with pilot valve in head | ||