| All Patents in class 91/461 |
Patents 1 -
14
of 14
      |
| Number | Date | Patentee | Title | Type |
| 989,009 | Apr. 11, 1911 | C.L. Heisler | Cylinder Drain Cock Operating Mechanism | locomotive drain cock apparatus |
| 992,161 | May 16, 1911 | A.D. Catlin | Valve mechanism | sawmill carriages |
| 1,353,656 | Sep. 21, 1920 | C.L. Heisler | Fluid Operated Motor | steam turbines |
| 1,931,452 | Oct. 17, 1933 | L.G. Wheeler | Hydraulic machine tool feed | multiple spindle drill presses |
| 1,937,244 | Nov. 28, 1933 | G.M. Pelton | Control means for dogging mechanism | sawmill dogs |
| 2,139,173 | Dec. 06, 1938 | E.G. Roehm, M. Romaine | Control Circuit for Broaching Machines | broaching machines |
| 2,170,503 | Aug. 22, 1939 | H. Ernst, M.E. Martellotti | Milling Machine | milling machines |
| 2,464,626 | Mar. 15, 1949 | A.P. Waterson | Pilot Operated Servo Valve | metalworking machine mechanisms |
| 2,474,134 | Jun. 21, 1949 | A.P. Waterson | Hydraulic Tool Control Unit | metalworking machine mechanisms |
| 2,496,756 | Feb. 07, 1950 | E.Y. Seborg | Control system for hydraulically driven machine tool elements | |
| 2,525,127 | Oct. 10, 1950 | W.F. Groene, H.J. Siekmann, W.R. Meyer | Hydraulic feed and control mechanism | crankshaft lathes |
| 2,619,072 | Nov. 25, 1952 | E.C. Clarke, Jr., P.A. Rickrode | Drop hammer control | drop hammers |
| 2,898,891 | Aug. 11, 1959 | R.J. Flanigan, N.V. Gusching | Hydraulic flow control | |
| 3,537,356 | Nov. 03, 1970 | E.I. Odell | Hydraulic Control System | machine tool controls |
