| All Patents in class 137/494 |
Patents 1 -
11
of 11
      |
| Number | Date | Patentee | Title | Type |
| 113,517 | Apr. 11, 1871 | B. Holly | Safety Valve | steam safety valves |
| 1,087,906 | Feb. 17, 1914 | C.R. Houghton | Relief-valve | pressure regulators |
| 1,702,550 | Feb. 19, 1929 | F.E. Stevenson | Hydraulic Reducing Valve | hydraulic valves |
| 1,806,301 | May 19, 1931 | J.L. Valley | Pressure controlled valve | pressure regulators |
| 2,027,706 | Jan. 14, 1936 | L.L. Schauer, J.H. McKewen | Counterbalance valve | drill presses |
| 2,143,229 | Jan. 10, 1939 | P.S. Russel | Control Device | industrial control apparatus |
| 2,218,930 | Oct. 22, 1940 | N. Cunningham | Automatic draft control | |
| 2,224,377 | Dec. 10, 1940 | G.H. Clark | Refrigerating Apparatus | refrigeration apparatus |
| 2,432,859 | Dec. 16, 1947 | F.Y. Carter | Refrigerant Flow Controlling Means | flow controls |
| 2,520,386 | Aug. 29, 1950 | E.J. Dillman | Refrigeration Expansion Valve | refrigeration apparatus |
| 2,606,571 | Aug. 12, 1952 | W. Ernst | Multipurpose control valve | hydraulic apparatus |
