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| All Patents in class 137/456 | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,946,882 | Feb. 13, 1934 | P.S. Russel | Valve | industrial valves | |
| 2,404,853 | Jul. 30, 1946 | W.S. Landon | Fluid Control for Oil Burners | flow controls | |
| 2,592,913 | Apr. 15, 1952 | M.E. Landon, Administratrix, W.S. Landon, deceased (Estate of) | Liquid Level Control Means | liquid level controls | |