Vacuum tube tester,申请号US19280252871-传众专利搜索

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发明名称	Vacuum tube tester
摘要
申请公布号	US1854900(A)	申请公布日期	1932.04.19
申请号	US19280252871	申请日期	1928.02.08
申请人	WESTON ELECTRICAL INSTRUMENT CORPORATION	发明人	JR. WILLIAM NELSON GOODWIN,
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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