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United States Patent 2,389,413
Issue Date: November 20, 1945

Current U.S. Class: 137/12 ; 137/215; 137/471; 137/496; 137/539; 137/596; 137/596.1; 137/596.2; 137/613; 251/57
Current International Class: F16K 24/00 (20060101); F16K 24/06 (20060101)



For U.S. patent law, rules, and procedures see MPEP.

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