Method of drilling a borehole.,申请号EP19860202313-传众专利搜索

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发明名称	Method of drilling a borehole.
摘要
申请公布号	EP0227193(A2)	申请公布日期	1987.07.01
申请号	EP19860202313	申请日期	1986.12.17
申请人	SHELL INTERNATIONALE RESEARCH MAATSCHAPPIJ B.V.	发明人	STEWART, ROBERT BRUCE
分类号	E21B21/12	主分类号	E21B21/12
代理机构		代理人
主权项
地址

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