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发明名称
摘要
申请公布号	JPH0819838(B2)	申请公布日期	1996.02.28
申请号	JP19900015288	申请日期	1990.01.25
申请人		发明人
分类号	E21D11/40;E21F13/00;(IPC1-7):E21D11/40	主分类号	E21D11/40
代理机构		代理人
主权项
地址

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