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| All Patents in class 137/636.4 | |||||
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| Number | Date | Patentee | Title | Type | |
| 2,166,940 | Jul. 25, 1939 | C.M. Conradson | Hydraulic Power System | machine tool controls | |
| 2,730,129 | Jan. 10, 1956 | H. Fritschi, A.H. Dall | Tracer Control Mechanism | ||
| 3,084,899 | Apr. 09, 1963 | C.L. Gschwind, L.A. Dever | Manual Three Direction Tracer | hydraulic apparatus | |
| 3,308,849 | Mar. 14, 1967 | P.R. Bohart | Valve for Dual Motor Control | hydraulic apparatus | |