CONDUIT FOR PASSING AND MEASURING FLOW OF AIR OUTFLOWING FROM A MINE VENTILATION SHAFT,申请号PL19810229731-传众专利搜索

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发明名称	CONDUIT FOR PASSING AND MEASURING FLOW OF AIR OUTFLOWING FROM A MINE VENTILATION SHAFT
摘要
申请公布号	PL127443(B2)	申请公布日期	1983.10.31
申请号	PL19810229731	申请日期	1981.02.16
申请人		发明人
分类号	E21F;E21F1/04;(IPC1-7):E21F1/04	主分类号	E21F
代理机构		代理人
主权项
地址

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