United States Patent: 3353364

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United States Patent

3,353,364

Issue Date:

November 21, 1967

Current U.S. Class: 405/189 ; 114/314; 166/351; 166/356; 166/358; 175/6

Current International Class: B63C 11/44 (20060101); B63C 11/00 (20060101); E21B 7/12 (20060101); E21B 33/03 (20060101); E21B 33/037 (20060101); E21B 43/36 (20060101); E21B 43/34 (20060101)

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Current U.S. Class:	405/189 ; 114/314; 166/351; 166/356; 166/358; 175/6
Current International Class:	B63C 11/44 (20060101); B63C 11/00 (20060101); E21B 7/12 (20060101); E21B 33/03 (20060101); E21B 33/037 (20060101); E21B 43/36 (20060101); E21B 43/34 (20060101)