| All Patents in class 91/517 |
Patents 1 -
8
of 8
      |
| Picture | Number | Date | Patentee | Title |
| | 1,353,656 | Sep. 21, 1920 | C.L. Heisler | Fluid Operated Motor |
| | 1,653,350 | Dec. 20, 1927 | W. Ernst | High Speed Hydraulic Press |
| | 1,851,622 | Mar. 29, 1932 | W. Ernst | Valve Mechanism for Hydraulic Presses |
| | 1,899,678 | Feb. 28, 1933 | R. Thoreson, H.F. MacMillin, W. Ernst | Hydraulic Press |
 | 2,353,246 | Jul. 11, 1944 | M.T. Knutzen | Control means for power-operated machine |
 | 2,393,918 | Jan. 29, 1946 | R.H. McClellan, C.E. Linden | Hydraulic operating and control mechanism |
| | 2,713,246 | Jul. 19, 1955 | H. Fritschi, A.H. Dall | Tracer Control Mechanism Having Independent Rate and Direction Control |
| | 3,003,472 | Oct. 10, 1961 | D.C. Miller, R.M. Ferris | Quill Actuating and Clamping Mechanism |
