| All Patents in class 91/420 |
Patents 1 -
10
of 10
      |
| Picture | Number | Date | Patentee | Title |
 | 1,285,475 | Nov. 19, 1918 | W. Turnwald | Automatic exhaust-valve |
| | 1,892,568 | Dec. 27, 1932 | W. Ernst | Surge Valve for Hydraulic Presses or the Like |
| | 2,077,894 | Apr. 20, 1937 | I. Patrick | Surge control valve for hydraulic presses |
| | 2,286,880 | Jun. 16, 1942 | W.A. Traut | Hydraulic Control System |
| | 2,444,474 | Jul. 06, 1948 | B.R. Purvin | Fluid pressure device |
 | 2,501,387 | Mar. 21, 1950 | G. Haumann | Veneer lathe |
| | 2,730,074 | Jan. 10, 1956 | W. Ernst | Servo-motor valve |
| | 2,951,342 | Sep. 06, 1960 | H.E. Boyer, N.V. Gusching, W.H. Ulman, D.E. Lundeen | Electro-hydraulic servo system |
| | 3,137,213 | Jun. 16, 1964 | J.H. Marcotte, H.A. Bryant | Automatic Bleeder Valve |
| | 6,988,363 | Jan. 24, 2006 | M. Bitter | Hydraulic Active Boom Suspension for a Telehandler |
