| All Patents in class 137/625.68 |
Patents 1 -
12
of 12
      |
| Number | Date | Patentee | Title | Type |
| 78,933 | Jun. 16, 1868 | D. Davy | Steam Balanced Valve | drop hammers |
| 215,293 | May 13, 1879 | D.C. Prescott | Improvement in balanced valves for steam-engines | steam engine valves |
| 332,632 | Dec. 15, 1885 | P. Amington | Piston Valve | steam engine valve gear |
| 368,422 | Aug. 16, 1887 | C.T. Porter | Valve for steam-engines | steam engine valves |
| 669,284 | Mar. 05, 1901 | G.M. Pelton | Reciprocating Valve | steam valves |
| 808,014 | Dec. 19, 1905 | E.T. Cope | Steam Engine Valve | steam engine valves |
| 992,349 | May 16, 1911 | W.F. Gould | Balanced Slide-Valve | steam engine valves |
| 1,819,703 | Aug. 18, 1931 | W. Ernst | Valve | hydraulic motor controls |
| 2,365,748 | Dec. 26, 1944 | F.W. Curtis | Hydraulic Circuit | milling machines |
| 2,630,135 | Mar. 03, 1953 | C. Johnson | Fluid valve for duplicating system | milling machine accessories |
| 3,084,899 | Apr. 09, 1963 | C.L. Gschwind, L.A. Dever | Manual Three Direction Tracer | hydraulic apparatus |
| 3,163,180 | Dec. 29, 1964 | J.C. Campbell | Plunger Construction for Fluid Flow Control Valve | hydraulic apparatus |
