FRUSTOCONICAL SCREWTHREAD FOR TUBES,申请号EP19910420417-传众专利搜索

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发明名称	FRUSTOCONICAL SCREWTHREAD FOR TUBES
摘要
申请公布号	EP0488912(A3)	申请公布日期	1993.03.24
申请号	EP19910420417	申请日期	1991.11.25
申请人	VALLOUREC INDUSTRIES;SUMITOMO METAL INDUSTRIES, LTD.	发明人	NOEL, THIERRY;NAGASAKU, SHIGEO
分类号	E21B17/042;F16L15/00;(IPC1-7):E21B17/042	主分类号	E21B17/042
代理机构		代理人
主权项
地址

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