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发明名称
摘要
申请公布号	KR101054876(B1)	申请公布日期	2011.08.08
申请号	KR20090089111	申请日期	2009.09.21
申请人		发明人
分类号	E21B3/02;E21B7/02	主分类号	E21B3/02
代理机构		代理人
主权项
地址

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