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| All Patents in class 137/635 | |||||
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| Number | Date | Patentee | Title | Type | |
| 2,313,438 | Mar. 09, 1943 | W.G. Hoelscher | Fluid Operated Gear Shifting Mechanism | metalworking speed changing mechanisms | |
| 2,579,998 | Dec. 25, 1951 | E.P. Bullard, C.M. Grinage | Lathe Control | ||
| 3,052,262 | Sep. 04, 1962 | W.L. McCann | Power Actuated Multiple Valve | hydraulic apparatus | |