METHOD OF ROOF CONTROL IN MINING OF STEEP COAL SEAM,申请号SU19874265765-传众专利搜索

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发明名称	METHOD OF ROOF CONTROL IN MINING OF STEEP COAL SEAM
摘要
申请公布号	SU1481404(A1)	申请公布日期	1989.05.23
申请号	SU19874265765	申请日期	1987.05.04
申请人	DO NI UGOLNYJ INSTITUT	发明人	SHAPOVAL NIKOLAJ A,SU;LITVINOV YURIJ G,SU;KURITSYN BORIS I,SU;VOSKOBOEV FRIDRIKH N,SU
分类号		主分类号
代理机构		代理人
主权项
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