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United States Patent
3,261,398
Issue Date:
July 19, 1966
Current U.S. Class:
166/352
; 166/357; 166/366; 166/368
Current International Class:
E21B 43/01 (20060101); E21B 41/04 (20060101); E21B 41/00 (20060101); E21B 43/00 (20060101); E21B 43/36 (20060101); E21B 43/34 (20060101)
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