METHOD OF VENTILATING MINE WORKINGS AND APPARATUS THEREFOR,申请号PL19850255481-传众专利搜索

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发明名称	METHOD OF VENTILATING MINE WORKINGS AND APPARATUS THEREFOR
摘要
申请公布号	PL150802(B1)	申请公布日期	1990.07.31
申请号	PL19850255481	申请日期	1985.09.20
申请人		发明人
分类号	E21F;E21F1/00;(IPC1-7):E21F1/00	主分类号	E21F
代理机构		代理人
主权项
地址

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