| All Patents in class 137/625.48 |
Patents 1 -
7
of 7
      |
| Number | Date | Patentee | Title | Type |
| 8,283X | Jun. 25, 1834 | H. Strait | Construction of valves on the principle of a balance | |
| 479,273 | Jul. 19, 1892 | M.E. Hershey | Piston-valve | steam engine valves |
| 1,568,061 | Jan. 05, 1926 | E.R. Draver | Exhaust cut-out | |
| 1,594,052 | Jul. 27, 1926 | E.R. Draver | Exhaust cut-out | |
| 1,623,580 | Apr. 05, 1927 | E.R. Draver | Exhaust cut-out | |
| 1,820,653 | Aug. 25, 1931 | H. Ernst | Hydraulic Valve | hydraulic metalworking presses |
| 2,600,746 | Jun. 17, 1952 | W. Ernst | Fluid Pressure Control Valve | hydraulic apparatus |
