METHOD AND APPARATUS FOR WORKING THIN AND ULTRATHIN STEEP COAL SEAMS,申请号SU19894756417-传众专利搜索

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发明名称	METHOD AND APPARATUS FOR WORKING THIN AND ULTRATHIN STEEP COAL SEAMS
摘要
申请公布号	SU1689616(A1)	申请公布日期	1991.11.07
申请号	SU19894756417	申请日期	1989.11.09
申请人	DO GI PROEKTIROVANIYA ORGANIZATSII SHAKHTNOGO STROITELSTVA	发明人	BELOV YURIJ YA,SU;BALYCHEVTSEV IGOR A,SU
分类号	E21C41/18;E21C27/02	主分类号	E21C41/18
代理机构		代理人
主权项
地址

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