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发明名称	DRILL BIT & CUTTER
摘要
申请公布号	GB8502306(D0)	申请公布日期	1985.03.27
申请号	GB19850002306	申请日期	1985.01.30
申请人	NL INDUSTRIES INC	发明人
分类号	E21B10/42;E21B10/43;E21B10/56;E21B10/573;(IPC1-7):E21B10/56	主分类号	E21B10/42
代理机构		代理人
主权项
地址

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