METHOD OF AND APPARATUS FOR PREVENTING EXCESSIVE CONTAMINATION OF AIR AND LOWERING AIR TEMPERATURE IN A MINE WORKING,申请号PL19850256411-传众专利搜索

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发明名称	METHOD OF AND APPARATUS FOR PREVENTING EXCESSIVE CONTAMINATION OF AIR AND LOWERING AIR TEMPERATURE IN A MINE WORKING
摘要
申请公布号	PL147863(B1)	申请公布日期	1989.08.31
申请号	PL19850256411	申请日期	1985.11.21
申请人		发明人
分类号	E21F;E21F5/00;(IPC1-7):E21F5/00	主分类号	E21F
代理机构		代理人
主权项
地址

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