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发明名称
摘要
申请公布号	JPH0743260(Y2)	申请公布日期	1995.10.09
申请号	JP19910055311U	申请日期	1991.06.19
申请人		发明人
分类号	E21B17/04;E21B3/02;E21B3/035;(IPC1-7):E21B3/02	主分类号	E21B17/04
代理机构		代理人
主权项
地址

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