Portable vacuum tube characteristic demonstrator,申请号US19540417525-传众专利搜索

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发明名称	Portable vacuum tube characteristic demonstrator
摘要
申请公布号	US2838849(A)	申请公布日期	1958.06.17
申请号	US19540417525	申请日期	1954.03.19
申请人	FINKEL SEYMOUR S	发明人	FINKEL SEYMOUR S.
分类号	G01R31/25	主分类号	G01R31/25
代理机构		代理人
主权项
地址

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