Indicator device for bearing failures in drill bits,申请号US19600027903-传众专利搜索

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发明名称	Indicator device for bearing failures in drill bits
摘要
申请公布号	US3062302(A)	申请公布日期	1962.11.06
申请号	US19600027903	申请日期	1960.05.09
申请人	SHELL OIL COMPANY	发明人	TOTH FREDERICK J.;TOOMEY DAVID F.
分类号	E21B12/02	主分类号	E21B12/02
代理机构		代理人
主权项
地址

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