PREFORMED ELEMENTS FOR A ROTARY DRILL BIT,申请号EP19890116723-传众专利搜索

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发明名称	PREFORMED ELEMENTS FOR A ROTARY DRILL BIT
摘要
申请公布号	EP0360111(B1)	申请公布日期	1992.12.23
申请号	EP19890116723	申请日期	1989.09.09
申请人	EASTMAN CHRISTENSEN COMPANY	发明人	SMITH, REDD H.;LUND, JEFFREY B.
分类号	B22F7/06;E21B10/46;E21B10/60	主分类号	B22F7/06
代理机构		代理人
主权项
地址

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