APPARATUS FOR CHANGING CUTABILITY AND MINEABILITY OF STRATA,申请号PL19850252010-传众专利搜索

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发明名称	APPARATUS FOR CHANGING CUTABILITY AND MINEABILITY OF STRATA
摘要
申请公布号	PL146748(B1)	申请公布日期	1989.03.31
申请号	PL19850252010	申请日期	1985.02.18
申请人		发明人
分类号	E21C;E21C41/00;E21D23/16;(IPC1-7):E21C41/00	主分类号	E21C
代理机构		代理人
主权项
地址

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