| All Patents in class 137/549 |
Patents 1 -
7
of 7
      |
| Number | Date | Patentee | Title | Type |
| 1,786,402 | Dec. 23, 1930 | P.S. Russel | Regulator | pressure regulators |
| 2,014,541 | Sep. 17, 1935 | F.W. Wappat | Pressure regulating valve | steam valves |
| 2,019,461 | Oct. 29, 1935 | P.S. Russel | Control Means | flow controls |
| 2,152,781 | Apr. 04, 1939 | D.D. Wile | Control Device | temperature controls |
| 2,317,556 | Apr. 27, 1943 | P.S. Russel | Liquid Level Controlling Means | liquid level controls |
| 2,416,267 | Feb. 18, 1947 | W.S. Landon | Automatic Orifice Cleaning Device | pipe and orifice cleaners |
| 2,636,506 | Apr. 28, 1953 | C.W. St. Clair | Strainer-equipped condensation drainer | |
