Ball director for rock bits,申请号US19620197000-传众专利搜索

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发明名称	Ball director for rock bits
摘要
申请公布号	US3087558(A)	申请公布日期	1963.04.30
申请号	US19620197000	申请日期	1962.05.23
申请人	HUGHES TOOL COMPANY	发明人	JR. WALTER J. DOUGHERTY,
分类号	E21B10/18	主分类号	E21B10/18
代理机构		代理人
主权项
地址

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