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发明名称	MINING METHOD & APPARATUS
摘要
申请公布号	GB8725284(D0)	申请公布日期	1987.12.02
申请号	GB19870025284	申请日期	1987.10.28
申请人	PENTITH, G R O	发明人
分类号	E21C25/16;E21C27/10;E21C41/18;E21D9/10	主分类号	E21C25/16
代理机构		代理人
主权项
地址

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