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| All Patents in class 137/488 | |||||
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| Number | Date | Patentee | Title | Type | |
| 2,413,655 | Dec. 31, 1946 | P.S. Russel | Fuel Supply Controlling Means for Burners | flow controls | |
| 2,706,489 | Apr. 19, 1955 | T.V. Pedersen | Pressure Relief Valve | gas and liquid valves | |