AN ELECTRIC HEATER FOR OIL WELLS.,申请号AR19890314544-传众专利搜索

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发明名称	AN ELECTRIC HEATER FOR OIL WELLS.
摘要
申请公布号	AR244389(A1)	申请公布日期	1993.10.29
申请号	AR19890314544	申请日期	1989.07.31
申请人	PETROLEO BRASILEIRO S.A. - PETROBRAS	发明人
分类号	E21B36/04;E21B43/16;(IPC1-7):E21B36/04	主分类号	E21B36/04
代理机构		代理人
主权项
地址

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