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United States Patent
3,401,746
Issue Date:
September 17, 1968
Current U.S. Class:
166/352
Current International Class:
E21B 35/00 (20060101); E21B 43/017 (20060101); E21B 43/36 (20060101); E21B 43/34 (20060101); E21B 43/00 (20060101)
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