DRILL STEM CIRCUIT,申请号CAD398290-传众专利搜索

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发明名称	DRILL STEM CIRCUIT
摘要
申请公布号	CA398290(A)	申请公布日期	1941.07.29
申请号	CAD398290	申请日期
申请人	GEOPHYSICAL RESEARCH CORPORATION	发明人	JOHN EDWARD OWEN;DAVID GIBSON HAWTHORN
分类号		主分类号
代理机构		代理人
主权项
地址

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