Bi-metal drilling tooth,申请号US19640364427-传众专利搜索

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法人/股东/高管

发明名称	Bi-metal drilling tooth
摘要
申请公布号	US3311181(A)	申请公布日期	1967.03.28
申请号	US19640364427	申请日期	1964.05.04
申请人	FOWLER JOHN B	发明人	FOWLER JOHN B.
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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