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发明名称
摘要
申请公布号	JPS57105389(U)	申请公布日期	1982.06.29
申请号	JP19800179543U	申请日期	1980.12.16
申请人		发明人
分类号	E21B1/26;E21B1/00;(IPC1-7):E21C3/20	主分类号	E21B1/26
代理机构		代理人
主权项
地址

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