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发明名称
摘要
申请公布号	JPS578900(U)	申请公布日期	1982.01.18
申请号	JP19800084700U	申请日期	1980.06.16
申请人		发明人
分类号	E21D11/38;E01B23/02;E01B25/00;E01B25/04;E21F17/00;(IPC1-7):E21F17/00	主分类号	E21D11/38
代理机构		代理人
主权项
地址

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