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| All Patents in class 137/418 | |||||
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| Picture | Number | Date | Patentee | Title | |
| 2,019,461 | Oct. 29, 1935 | P.S. Russel | Control Means | ||
| 2,067,836 | Jan. 12, 1937 | A.k. Foulds | Control Means | ||
| 2,133,226 | Oct. 11, 1938 | A.G. Hann | Control Device | ||
| 2,139,616 | Dec. 06, 1938 | A.K. Foulds | Control Device | ||
| 2,189,662 | Feb. 06, 1940 | A.K. Foulds | Liquid Level Control Means | ||
| 2,234,088 | Mar. 04, 1941 | P.S. Russel | Control Device | ||
| 2,404,853 | Jul. 30, 1946 | W.S. Landon | Fluid Control for Oil Burners | ||