EARTH BORING BIT,申请号JP19860315891-传众专利搜索

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发明名称	EARTH BORING BIT
摘要
申请公布号	JPS62160397(A)	申请公布日期	1987.07.16
申请号	JP19860315891	申请日期	1986.12.26
申请人	HUGHES TOOL CO	发明人	BURUUSU HOORII BAA
分类号	E21B10/24;E21B10/22;E21B10/25;F16J15/34	主分类号	E21B10/24
代理机构		代理人
主权项
地址

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