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发明名称
MINE VENTILATION PIPE
摘要
申请公布号
PL147627(B1)
申请公布日期
1989.07.31
申请号
PL19850255801
申请日期
1985.10.15
申请人
发明人
分类号
E21F1/04;F24F;(IPC1-7):E21F1/04
主分类号
E21F1/04
代理机构
代理人
主权项
地址
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