Improvements relating to electron discharge tubes for purposes of sound recording or the like,申请号GB19330015174-传众专利搜索

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发明名称	Improvements relating to electron discharge tubes for purposes of sound recording or the like
摘要
申请公布号	GB403876(A)	申请公布日期	1934.01.04
申请号	GB19330015174	申请日期	1933.05.25
申请人	ALLGEMEINE ELEKTRICITAETS-GESELLSCHAFT	发明人
分类号	H01J29/52;H04N5/68	主分类号	H01J29/52
代理机构		代理人
主权项
地址

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