DRILL STRING ELEMENT,申请号AU19890033066-传众专利搜索

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发明名称	DRILL STRING ELEMENT
摘要
申请公布号	AU614827(B2)	申请公布日期	1991.09.12
申请号	AU19890033066	申请日期	1989.04.17
申请人	SANDVIK AB	发明人	KENNETH LARS LARSSON;SVEN PER-OLOF LILJEBRAND
分类号	E21B7/20;E21B17/00;E21B17/042;(IPC1-7):E21B17/042	主分类号	E21B7/20
代理机构		代理人
主权项
地址

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