AIR LOCKS IN UNDERGROUND MINING SYSTEMS,申请号GB19910011267-传众专利搜索

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发明名称	AIR LOCKS IN UNDERGROUND MINING SYSTEMS
摘要
申请公布号	GB2255948(A)	申请公布日期	1992.11.25
申请号	GB19910011267	申请日期	1991.05.24
申请人	* COAL INDUSTRY	发明人	NEIL HAWLEY * JACKSON
分类号	E21F1/14	主分类号	E21F1/14
代理机构		代理人
主权项
地址

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