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| All Patents in class 137/400 | |||||
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| Number | Date | Patentee | Title | Type | |
| 2,591,581 | Apr. 01, 1952 | C.H. Millerwise | Trip and Reset Mechanism for Float Operated Liquid Fuel Controlling Valves | liquid level controls | |
| 2,592,913 | Apr. 15, 1952 | M.E. Landon, Administratrix, W.S. Landon, deceased (Estate of) | Liquid Level Control Means | liquid level controls | |