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发明名称
摘要
申请公布号	JPH0663695(U)	申请公布日期	1994.09.09
申请号	JP19930003524U	申请日期	1993.02.09
申请人		发明人
分类号	E21B15/00;E21B17/10;(IPC1-7):E21B15/00	主分类号	E21B15/00
代理机构		代理人
主权项
地址

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