| All Patents in class 91/503 |
Patents 1 -
9
of 9
      |
| Picture | Number | Date | Patentee | Title |
| | 666,690 | Jan. 29, 1901 | C.K. Pickles | Engine |
 | 706,570 | Aug. 12, 1902 | O.G. Kipp | Lubricator |
 | 1,722,832 | Jul. 30, 1929 | D.H. West | Hydraulic transmission |
| | 1,945,391 | Jan. 30, 1934 | E. Benedek | Pump |
| | 2,096,907 | Oct. 26, 1937 | B.A. Linderman | Fluid pump |
| | 2,390,590 | Dec. 11, 1945 | M.P. Holmes | Hydraulic Device |
 | 2,520,632 | Aug. 29, 1950 | J. Greenhut | Hydraulic pump or motor |
| | 3,482,521 | Dec. 09, 1969 | M.L. Wolf | Hydraulic Pump with Variable Chamber |
| | 3,596,569 | Aug. 03, 1971 | J.D. Wisbey | Valve for a Closed-Loop Hydraulic Torque Amplifier |
