METHOD OF SUPPORTING THE ROOF OF WORKINGS AT PILLAR-LESS COAL MINING,申请号SU19792722050-传众专利搜索

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发明名称	METHOD OF SUPPORTING THE ROOF OF WORKINGS AT PILLAR-LESS COAL MINING
摘要
申请公布号	SU785503(A1)	申请公布日期	1980.12.07
申请号	SU19792722050	申请日期	1979.02.07
申请人	NI P K I PO DOBYCHE POLEZNYKH ISKOPAEMYKH OTKRYTYM SPOSOBOM MINISTERSTVA UGOLNOJ PROMY SSSR	发明人	MAKAROV VENIAMIN P,SU;MILMAN EDUARD N,SU;STARODUMOV NIKOLAJ A,SU
分类号	E21D13/02;(IPC1-7):E21D13/02	主分类号	E21D13/02
代理机构		代理人
主权项
地址

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