Earth drilling bit,申请号GB19590002786-传众专利搜索

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发明名称	Earth drilling bit
摘要
申请公布号	GB866731(A)	申请公布日期	1961.04.26
申请号	GB19590002786	申请日期	1959.01.26
申请人	H & L TOOTH COMPANY	发明人	LAUNDER ERNIE L.
分类号	E21B10/42	主分类号	E21B10/42
代理机构		代理人
主权项
地址

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