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发明名称
摘要
申请公布号	SU454358(A1)	申请公布日期	1974.12.25
申请号	SU19721851466	申请日期	1972.11.30
申请人		发明人
分类号	E21F17/00;(IPC1-7):E21F17/00	主分类号	E21F17/00
代理机构		代理人
主权项
地址

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