Drill bits for earth formations,申请号GB19590040665-传众专利搜索

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发明名称	Drill bits for earth formations
摘要
申请公布号	GB897516(A)	申请公布日期	1962.05.30
申请号	GB19590040665	申请日期	1959.11.30
申请人	JAMES TRAHAN WILLIAMS	发明人
分类号	E21B10/62;E21B10/627	主分类号	E21B10/62
代理机构		代理人
主权项
地址

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