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发明名称
摘要
申请公布号	DE2534007(B2)	申请公布日期	1979.10.25
申请号	DE19752534007	申请日期	1975.07.30
申请人	BJ-HUGHES INC., LONG BEACH, CALIF. (V.ST.A.)	发明人	WILEY, MARK HARRINGTON, HOUSTON, TEX. (V.ST.A.)
分类号	E21B19/14;B25B13/50;B25B21/00;E21B19/16;(IPC1-7):B25B7/18	主分类号	E21B19/14
代理机构		代理人
主权项
地址

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