EARTH BORING BIT WITH COOLED JOURNAL BEARING,申请号GB19810033751-传众专利搜索

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发明名称	EARTH BORING BIT WITH COOLED JOURNAL BEARING
摘要
申请公布号	GB2093498(A)	申请公布日期	1982.09.02
申请号	GB19810033751	申请日期	1981.11.09
申请人	HUGHES TOOL CO	发明人
分类号	E21B10/18;E21B10/22;E21B10/24;(IPC1-7):E21B10/18	主分类号	E21B10/18
代理机构		代理人
主权项
地址

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