| All Patents in class 137/625.68 |
Patents 1 -
10
of 12
      |
| Picture | Number | Date | Patentee | Title |
| | 78,933 | Jun. 16, 1868 | D. Davy | Steam Balanced Valve |
 | 215,293 | May 13, 1879 | D.C. Prescott | Improvement in balanced valves for steam-engines |
| | 332,632 | Dec. 15, 1885 | P. Amington | Piston Valve |
 | 368,422 | Aug. 16, 1887 | C.T. Porter | Valve for steam-engines |
| | 669,284 | Mar. 05, 1901 | G.M. Pelton | Reciprocating Valve |
| | 808,014 | Dec. 19, 1905 | E.T. Cope | Steam Engine Valve |
 | 992,349 | May 16, 1911 | W.F. Gould | Balanced Slide-Valve |
| | 1,819,703 | Aug. 18, 1931 | W. Ernst | Valve |
| | 2,365,748 | Dec. 26, 1944 | F.W. Curtis | Hydraulic Circuit |
 | 2,630,135 | Mar. 03, 1953 | C. Johnson | Fluid valve for duplicating system |
