Improvements in or relating to well drilling systems and methods of operating such systems,申请号GB19540035905-传众专利搜索

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发明名称	Improvements in or relating to well drilling systems and methods of operating such systems
摘要
申请公布号	GB762749(A)	申请公布日期	1956.12.05
申请号	GB19540035905	申请日期	1954.12.10
申请人	N. V. DE BATAAFSCHE PETROLEUM MAATSCHAPPIJ	发明人	WHITTLE FRANK
分类号	E21B4/02	主分类号	E21B4/02
代理机构		代理人
主权项
地址

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