Improvements relating to earth boring equipment,申请号GB19590032893-传众专利搜索

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发明名称	Improvements relating to earth boring equipment
摘要
申请公布号	GB941961(A)	申请公布日期	1963.11.20
申请号	GB19590032893	申请日期	1959.09.28
申请人	DOWTY ROTOL LIMITED	发明人	KNIGHTS RICHARD NORTHAM;SMITH HORACE HENRY
分类号	E21B19/14;E21B19/20	主分类号	E21B19/14
代理机构		代理人
主权项
地址

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