JOINT FOR DOUBLE-WALLED DRILL PIPE,申请号CAD854056-传众专利搜索

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发明名称	JOINT FOR DOUBLE-WALLED DRILL PIPE
摘要
申请公布号	CA854056(A)	申请公布日期	1970.10.20
申请号	CAD854056	申请日期	1967.11.21
申请人	BECKER DRILLING (ALBERTA) LTD.	发明人	ALVIN V. SANDQUIST;FLOYD W. BECKER
分类号	E21B17/04;E21B17/18	主分类号	E21B17/04
代理机构		代理人
主权项
地址

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