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发明名称
摘要
申请公布号	JPS62176285(U)	申请公布日期	1987.11.09
申请号	JP19860065338U	申请日期	1986.04.30
申请人		发明人
分类号	E21B10/32;E21B7/28;(IPC1-7):E21B7/28	主分类号	E21B10/32
代理机构		代理人
主权项
地址

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