STEEL DOUBLE TIMER LINING OF MINING GALLERIES,申请号PL19860262461-传众专利搜索

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发明名称	STEEL DOUBLE TIMER LINING OF MINING GALLERIES
摘要
申请公布号	PL262461(A1)	申请公布日期	1988.06.23
申请号	PL19860262461	申请日期	1986.11.17
申请人		发明人
分类号	E21D;(IPC1-7):E21D/	主分类号	E21D
代理机构		代理人
主权项
地址

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