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发明名称
摘要
申请公布号	JP4000216(B2)	申请公布日期	2007.10.31
申请号	JP19980093145	申请日期	1998.04.06
申请人		发明人
分类号	E21B3/02;E21B3/025;E02D7/22;E21B7/20	主分类号	E21B3/02
代理机构		代理人
主权项
地址

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