METHOD OF CARRYING ON MINING WORK IN SAFETY PILLARS OF BORE-HOLES,申请号PL19870267571-传众专利搜索

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发明名称	METHOD OF CARRYING ON MINING WORK IN SAFETY PILLARS OF BORE-HOLES
摘要
申请公布号	PL155314(B1)	申请公布日期	1991.11.29
申请号	PL19870267571	申请日期	1987.09.03
申请人		发明人
分类号	E21C;E21C41/16;(IPC1-7):E21C41/16	主分类号	E21C
代理机构		代理人
主权项
地址

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