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United States Patent 3,113,620
Issue Date: December 10, 1963

Current U.S. Class: 166/257; 166/247; 376/275; 166/259
Current CPC Class: E21B 43/2635 (20130101)
Current International Class: E21B 43/263 (20060101); E21B 43/25 (20060101)


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