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| All Patents in class 251/289 | |||||
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| Number | Date | Patentee | Title | Type | |
| 755,734 | Mar. 29, 1904 | T. Barrow | Valve Operating Mechanism | industrial control apparatus | |
| 2,849,206 | Aug. 26, 1958 | A.P. Waterson | Hydraulic tracer control valve | machine tool controls | |
| 3,084,899 | Apr. 09, 1963 | C.L. Gschwind, L.A. Dever | Manual Three Direction Tracer | hydraulic apparatus | |