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发明名称	DRILLING
摘要
申请公布号	GB1541559(A)	申请公布日期	1979.03.07
申请号	GB19740046941	申请日期	1974.10.30
申请人	BRITISH PETROLEUM CO LTD	发明人
分类号	E21B17/07;(IPC1-7):E21B17/00	主分类号	E21B17/07
代理机构		代理人
主权项
地址

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