| All Patents in class 91/445 |
Patents 1 -
14
of 14
      |
| Number | Date | Patentee | Title | Type |
| 50,320 | Oct. 10, 1865 | J.M. Albertson | Improvement in cut-off valves | |
| 276,076 | Apr. 17, 1883 | W.H. Ridgway | Elevator | hoists, winches, come-alongs |
| 527,213 | Oct. 09, 1894 | E.J. McClellan | Milling Machine | milling machines |
| 666,156 | Jan. 15, 1901 | E.B. Ridgway | Steam hydraulic elevator | elevators and lifts |
| 1,884,277 | Oct. 25, 1932 | B. Sassen | Self Regulating Hydraulic System | hydraulic apparatus |
| 2,006,312 | Jun. 25, 1935 | B. Sassen, H. Ernst | Compensating Bleeder Valve | hydraulic apparatus |
| 2,027,706 | Jan. 14, 1936 | L.L. Schauer, J.H. McKewen | Counterbalance valve | drill presses |
| 2,216,800 | Oct. 08, 1940 | W.G. Baldenhofer | Hydraulic Control Device | hydraulic apparatus |
| 2,353,246 | Jul. 11, 1944 | M.T. Knutzen | Control means for power-operated machine | |
| 2,464,626 | Mar. 15, 1949 | A.P. Waterson | Pilot Operated Servo Valve | metalworking machine mechanisms |
| 2,536,006 | Dec. 26, 1950 | F.O. Wetzel, C.E. Linden | Interlocked control for the clamps and spindle of a radial drill or the like | radial drill presses |
| 2,618,244 | Nov. 18, 1952 | E.G. Roehm | Pilot Valve Controlled Tracer Valve | hydraulic apparatus |
| 2,889,755 | Jun. 09, 1959 | W. Schroeder | Machine Tool Transmission | metalworking power transmission |
| 3,075,503 | Jan. 29, 1963 | W.A. Kimsey | Hydraulic screw feed mechanism | boring and turning machines |
