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发明名称
摘要
申请公布号	FR2488938(B1)	申请公布日期	1984.07.13
申请号	FR19810015339	申请日期	1981.08.07
申请人	CHRISTENSEN INC	发明人
分类号	E21B25/08;(IPC1-7):E21B25/00	主分类号	E21B25/08
代理机构		代理人
主权项
地址

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