APPARATUS FOR RECOVERING A DRILL STEM,申请号CAD901626-传众专利搜索

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发明名称	APPARATUS FOR RECOVERING A DRILL STEM
摘要
申请公布号	CA901626(A)	申请公布日期	1972.05.30
申请号	CAD901626	申请日期
申请人	BECKER DRILLS LIMITED	发明人	ALVIN V. SANDQUIST
分类号	E21B23/04;E21B31/00;E21B31/20;(IPC1-7):E21B31/00	主分类号	E21B23/04
代理机构		代理人
主权项
地址

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