STEEL LININIG FOR A PASSAGE BETWEEN MINE SHAFT INLET AND THE SHAFT PROPER,申请号PL19870267808-传众专利搜索

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发明名称	STEEL LININIG FOR A PASSAGE BETWEEN MINE SHAFT INLET AND THE SHAFT PROPER
摘要
申请公布号	PL155201(B1)	申请公布日期	1991.10.31
申请号	PL19870267808	申请日期	1987.09.16
申请人		发明人
分类号	E21D;E21D5/06;E21D11/36;(IPC1-7):E21D5/06	主分类号	E21D
代理机构		代理人
主权项
地址

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