TREPAN DE FORAGE PAR ROTATION,申请号FR19770016479-传众专利搜索

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发明名称	TREPAN DE FORAGE PAR ROTATION
摘要
申请公布号	FR2353702(A1)	申请公布日期	1977.12.30
申请号	FR19770016479	申请日期	1977.05.31
申请人	SHELL INTERNATIONAL RESEARCH MAA	发明人
分类号	E21B10/46;E21B10/58;(IPC1-7):E21B9/36;E21B21/00	主分类号	E21B10/46
代理机构		代理人
主权项
地址

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