Magnetic fishing tool,申请号US19460667796-传众专利搜索

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发明名称	Magnetic fishing tool
摘要
申请公布号	US2539435(A)	申请公布日期	1951.01.30
申请号	US19460667796	申请日期	1946.05.07
申请人	KIRBY JOHN H	发明人	KIRBY JOHN H.
分类号	E21B31/06	主分类号	E21B31/06
代理机构		代理人
主权项
地址

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