Vacuum tube apparatus,申请号US19290412428-传众专利搜索

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发明名称	Vacuum tube apparatus
摘要
申请公布号	US1822370(A)	申请公布日期	1931.09.08
申请号	US19290412428	申请日期	1929.12.07
申请人	GRIGSBY-GRUNOW COMPANY	发明人	PERRY ARTHUR R.
分类号	H01J9/06	主分类号	H01J9/06
代理机构		代理人
主权项
地址

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