DOWNHOLE RETRIEVABLE DRILL BIT,申请号GB19850012032-传众专利搜索

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发明名称	DOWNHOLE RETRIEVABLE DRILL BIT
摘要
申请公布号	GB8512032(D0)	申请公布日期	1985.06.19
申请号	GB19850012032	申请日期	1985.05.13
申请人	MAYFIELD, W G	发明人
分类号	E21B10/64;E21B4/00;E21B10/66	主分类号	E21B10/64
代理机构		代理人
主权项
地址

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