DRILL BIT ASSEMBLY WITH CONCENTRIC ROTATABLE CUTTING ELEMENTS AND METHOD OF DRILLING,申请号EP19900305734-传众专利搜索

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发明名称	DRILL BIT ASSEMBLY WITH CONCENTRIC ROTATABLE CUTTING ELEMENTS AND METHOD OF DRILLING
摘要
申请公布号	EP0400921(A3)	申请公布日期	1991.09.11
申请号	EP19900305734	申请日期	1990.05.25
申请人	WEIR PUMPS LIMITED	发明人	RYALL, MICHAEL LESLIE
分类号	E21B4/16;(IPC1-7):E21B4/16	主分类号	E21B4/16
代理机构		代理人
主权项
地址

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