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发明名称	Tang
摘要
申请公布号	NO304121(B1)	申请公布日期	1998.10.26
申请号	NO19930002086	申请日期	1993.06.08
申请人	WEATHERFORD/LAMB INC	发明人	PIETRAS, BERND-GEORG
分类号	E21B19/16;(IPC1-7):E21B19/16	主分类号	E21B19/16
代理机构		代理人
主权项
地址

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