| All Patents in class 137/508 |
Patents 1 -
6
of 6
      |
| Number | Date | Patentee | Title | Type |
| 8,923 | May 04, 1852 | J. McClintic | Differential safety-valve | steam safety valves |
| 69,527 | Oct. 01, 1867 | G. Smith, J.N. Wrigley | Improvement in steam safety-valves | steam engine valves |
| 2,071,143 | Feb. 16, 1937 | L.l. Scott | Automatic Valve | flow controls |
| 2,100,997 | Nov. 30, 1937 | P.S. Russel | Pressure Control Device | pressure regulators |
| 2,123,826 | Jul. 12, 1938 | E.J. Dillman | Nozzle | water nozzles |
| 2,460,048 | Jan. 25, 1949 | A. Von Wangenheim | Pressure Regulating Means | pressure regulators |
