IMPROVEMENTS IN OR RELATING TO ROTARY DRILL BITS,申请号GB19900025457-传众专利搜索

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发明名称	IMPROVEMENTS IN OR RELATING TO ROTARY DRILL BITS
摘要
申请公布号	GB9025457(D0)	申请公布日期	1991.01.09
申请号	GB19900025457	申请日期	1990.11.22
申请人	REED TOOL COMPANY LIMITED	发明人
分类号	E21B10/42;E21B10/43;E21B10/54;E21B10/55	主分类号	E21B10/42
代理机构		代理人
主权项
地址

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