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发明名称
MINE WORKING AIR DUSTINESS CONTROL METHOD
摘要
申请公布号
PL145376(B1)
申请公布日期
1988.09.30
申请号
PL19840248633
申请日期
1984.07.09
申请人
发明人
分类号
E21F;E21F5/20;(IPC1-7):E21F5/20
主分类号
E21F
代理机构
代理人
主权项
地址
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