Drill bit having diamond film cutting surface,申请号US19890411419-传众专利搜索

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发明名称	Drill bit having diamond film cutting surface
摘要
申请公布号	US4976324(A)	申请公布日期	1990.12.11
申请号	US19890411419	申请日期	1989.09.22
申请人	BAKER HUGHES INCORPORATED	发明人	TIBBITTS, GORDON A.
分类号	E21B10/56;E21B10/567	主分类号	E21B10/56
代理机构		代理人
主权项
地址

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