Improvements in or relating to rotary drilling bits for drilling earth formations,申请号GB19540017665-传众专利搜索

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发明名称	Improvements in or relating to rotary drilling bits for drilling earth formations
摘要
申请公布号	GB774076(A)	申请公布日期	1957.05.08
申请号	GB19540017665	申请日期	1952.09.26
申请人	HERBERT JENNINGS HAWTHORNE;EARL MARSHALL WEAVER	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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