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发明名称
摘要
申请公布号	JPS64695(U)	申请公布日期	1989.01.05
申请号	JP19870093857U	申请日期	1987.06.17
申请人		发明人
分类号	E21B3/02;E21B7/04;(IPC1-7):E21B7/04	主分类号	E21B3/02
代理机构		代理人
主权项
地址

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