| All Patents in class 251/3 |
Patents 16 -
30
of 40
      |
| Number | Date | Patentee | Title | Type |
| 2,412,549 | Dec. 10, 1946 | T.S. Armandroff, E.W. Yates | Automatic Pattern Controlled Milling Machine | milling machines |
| 2,456,158 | Dec. 14, 1948 | W.L. Tancred | Tracer and Automatic Pattern Feed | form producing lathes |
| 2,586,654 | Feb. 19, 1952 | W.G. Hoelscher | Tracer Control Valve | tracer controlled lathes |
| 2,602,437 | Jul. 08, 1952 | W.L. Tancred | Hydraulic Profiler for Truing Devices and the Like | hydraulic apparatus |
| 2,612,184 | Sep. 30, 1952 | W.I. Evans | Sensitive Hydraulic Tracer Valve | hydraulic apparatus |
| 2,618,244 | Nov. 18, 1952 | E.G. Roehm | Pilot Valve Controlled Tracer Valve | hydraulic apparatus |
| 2,620,823 | Dec. 09, 1952 | R.D. Wortendyke, R.R. Adams | Tracer Valve Mechanism with Dashpot | hydraulic apparatus |
| 2,686,650 | Aug. 17, 1954 | W.I. Evans | Hydraulic Tracing Mechanism | profiling machines |
| 2,704,012 | Mar. 15, 1955 | D.R. Trinkle | Automatic Profiling Machine | profiling machines |
| 2,726,581 | Dec. 13, 1955 | E.G. Roehm | Tracer Controlled Safety Device | profiling machines |
| 2,730,129 | Jan. 10, 1956 | H. Fritschi, A.H. Dall | Tracer Control Mechanism | |
| 2,766,003 | Oct. 09, 1956 | H. Fritschi, A.H. Dall | Tracer Head Mechanism | profiling machines |
| 2,791,885 | May 14, 1957 | B. Sassen | Hydraulic Tracer Control | hydraulic apparatus |
| 2,849,206 | Aug. 26, 1958 | A.P. Waterson | Hydraulic tracer control valve | machine tool controls |
| 2,913,945 | Nov. 24, 1959 | A. Anderson, B.R. Granberg, C.H. Johnson | Lathes | |
