Well drilling rig,申请号US19460674612-传众专利搜索

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发明名称	Well drilling rig
摘要
申请公布号	US2613059(A)	申请公布日期	1952.10.07
申请号	US19460674612	申请日期	1946.06.05
申请人	UNITED STATES STEEL COMPANY	发明人	MAIER AUGUST R.;JACOBY JOHN W.
分类号	E21B3/06	主分类号	E21B3/06
代理机构		代理人
主权项
地址

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