REVERSE CIRCULATION DRILLING SYSTEM WITH BIT LOCKED UNDERREAMER ARMS,申请号EP19980906021-传众专利搜索

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发明名称	REVERSE CIRCULATION DRILLING SYSTEM WITH BIT LOCKED UNDERREAMER ARMS
摘要
申请公布号	EP0960254(A1)	申请公布日期	1999.12.01
申请号	EP19980906021	申请日期	1998.01.28
申请人	HOLTE, ARDIS L.	发明人	HOLTE, ARDIS L.
分类号	E21B10/26;E21B4/14;E21B10/32;E21B10/36;E21B10/66;E21B21/16;(IPC1-7):E21B10/40	主分类号	E21B10/26
代理机构		代理人
主权项
地址

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