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