Magnetic plug for core bits,申请号US19490128066-传众专利搜索

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发明名称	Magnetic plug for core bits
摘要
申请公布号	US2628822(A)	申请公布日期	1953.02.17
申请号	US19490128066	申请日期	1949.11.18
申请人	J. E. JONES	发明人	HERNDON LAWRENCE O.
分类号	E21B10/48;E21B12/04;E21B31/06	主分类号	E21B10/48
代理机构		代理人
主权项
地址

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