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| All Patents in class 137/506 | |||||
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| Picture | Number | Date | Patentee | Title | |
 | 2,014,541 | Sep. 17, 1935 | F.W. Wappat | Pressure regulating valve | |
 | 2,218,930 | Oct. 22, 1940 | N. Cunningham | Automatic draft control | |
| 2,329,040 | Sep. 07, 1943 | B.E. Folke | Lubricator Oil Control Valve | ||