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发明名称
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摘要
申请公布号
PL152533(B1)
申请公布日期
1991.01.31
申请号
PL19860260701
申请日期
1986.07.16
申请人
发明人
分类号
E21F;E21F15/10;(IPC1-7):E21F15/10
主分类号
E21F
代理机构
代理人
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