Wear indicating attachment for drilling bits,申请号US19470735628-传众专利搜索

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发明名称	Wear indicating attachment for drilling bits
摘要
申请公布号	US2461164(A)	申请公布日期	1949.02.08
申请号	US19470735628	申请日期	1947.03.19
申请人	FRANCIS LEWIS FARRAL	发明人	LEWIS FARRAL FRANCIS
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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