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| All Patents in class 137/636 | |||||
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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 | |
| 2,448,675 | Sep. 07, 1948 | P.L. Loewe | Control mechanism for a plurality of motors | ||
| 2,849,206 | Aug. 26, 1958 | A.P. Waterson | Hydraulic tracer control valve | machine tool controls | |