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发明名称
摘要
申请公布号	JPH0431346(Y2)	申请公布日期	1992.07.28
申请号	JP19870155945U	申请日期	1987.10.12
申请人		发明人
分类号	E21B4/18;E02D17/13;E02F5/02;(IPC1-7):E21B4/18	主分类号	E21B4/18
代理机构		代理人
主权项
地址

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