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发明名称
摘要
申请公布号
GB1304934(A)
申请公布日期
1973.01.31
申请号
GB19700014528
申请日期
1970.03.25
申请人
发明人
分类号
E21F15/06;(IPC1-7):E21F15/00;E02F3/70;E02F3/76
主分类号
E21F15/06
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