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United States Patent  3,429,948
Issue Date: February 25, 1969  
Current U.S. Class: 525/127 ; 525/129; 525/130
Current International Class:  C08G 18/00 (20060101); C08L 57/00 (20060101); C08L 75/00 (20060101); C08L 75/06 (20060101); C08G 18/86 (20060101)

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