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United States Patent
3,111,692
Issue Date:
November 26, 1963
Current U.S. Class:
114/264
; 114/265; 137/236.1; 166/352; 166/364; 166/365; 166/366; 175/8; 405/223.1
Current International Class:
E21B 43/01 (20060101); E21B 43/00 (20060101)
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