| All Patents in class 91/446 |
Patents 1 -
12
of 12
      |
| Number | Date | Patentee | Title | Type |
| 646,458 | Apr. 03, 1900 | H.A. Pedrick | Pneumatic Hoisting Apparatus | hoists, winches, come-alongs |
| 675,112 | May 28, 1901 | R.A. Rutherford | Pneumatic Hoisting Apparatus | hoists, winches, come-alongs |
| 1,585,908 | May 25, 1926 | F.B. Moorman | Change valve | seed or nut oil apparatus |
| 1,693,109 | Nov. 27, 1928 | W. Ernst | Semiautomatic Valve | hydraulic valves |
| 2,000,420 | May 07, 1935 | L.L. Schauer, A.M. Sosa, J.H. McKewen | Hydraulic transmission system | radial drill presses |
| 2,139,173 | Dec. 06, 1938 | E.G. Roehm, M. Romaine | Control Circuit for Broaching Machines | broaching machines |
| 2,286,880 | Jun. 16, 1942 | W.A. Traut | Hydraulic Control System | |
| 2,360,695 | Oct. 17, 1944 | R.H. McClellan, C.E. Linden | Hydraulic gear shifting and driving system | radial drill presses |
| 2,441,339 | May 11, 1948 | S.A. Rivington | Hydraulic system | |
| 2,573,368 | Oct. 30, 1951 | E.Y. Seborg | Reciprocatory drive for machine tools | |
| 2,849,206 | Aug. 26, 1958 | A.P. Waterson | Hydraulic tracer control valve | machine tool controls |
| 2,972,868 | Feb. 28, 1961 | B. Sassen | Machine tool slide control | |
