| All Patents in class 251/3 |
Patents 31 -
40
of 40
      |
| Number | Date | Patentee | Title | Type |
| 2,914,292 | Nov. 24, 1959 | A. Anderson | Tracer valve | |
| 2,949,893 | Aug. 23, 1960 | H.C. McCurdy | Tracer Mechanism | metalworking machine mechanisms |
| 2,972,868 | Feb. 28, 1961 | B. Sassen | Machine tool slide control | |
| 3,026,680 | Mar. 27, 1962 | W.I. Evans | Hydraulic System for Pattern Controlled Machine | profiling machines |
| 3,074,683 | Jan. 22, 1963 | A. Kullman | Single Plane Tracer Valve | tracer controlled lathes |
| 3,084,899 | Apr. 09, 1963 | C.L. Gschwind, L.A. Dever | Manual Three Direction Tracer | hydraulic apparatus |
| 3,139,002 | Jun. 30, 1964 | W.I. Evans | Tracer System and Mechanism Therefor for Profile or Scanning Operations | profiling machines |
| 3,194,535 | Jul. 13, 1965 | W.I. Evans | Valve for Pattern Controlled Machine | hydraulic apparatus |
| 3,222,998 | Dec. 14, 1965 | J.F. Verhoeven | Two Dimensional Hydraulic Tracing System | profiling machines |
| 3,286,599 | Nov. 22, 1966 | W.I. Evans | Tracing Mechanism for Amplified Flow | form producing lathes |
