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发明名称
HEATER FOR HEATING AIR BEING DRAWN INTO UNDERGROUND MINE AREAS THROUGH A MINE SHAFT
摘要
申请公布号
PL147064(B1)
申请公布日期
1989.04.29
申请号
PL19850253284
申请日期
1985.05.07
申请人
发明人
分类号
E21F;E21F3/00;F24H3/00;(IPC1-7):F24H3/00
主分类号
E21F
代理机构
代理人
主权项
地址
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