DRILL SPRING FOR USE IN BOREHOLE DRILLING,申请号GB19790001611-传众专利搜索

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发明名称	DRILL SPRING FOR USE IN BOREHOLE DRILLING
摘要
申请公布号	GB2039567(A)	申请公布日期	1980.08.13
申请号	GB19790001611	申请日期	1979.01.16
申请人	INTOROLA LTD	发明人
分类号	E21B17/07;E21B44/00;F16F9/53;(IPC1-7):E21B17/00	主分类号	E21B17/07
代理机构		代理人
主权项
地址

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