Improvements in or relating to electron discharge tubes used for the recording of sounds,申请号GB19320005260-传众专利搜索

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发明名称	Improvements in or relating to electron discharge tubes used for the recording of sounds
摘要
申请公布号	GB396830(A)	申请公布日期	1933.08.17
申请号	GB19320005260	申请日期	1932.02.22
申请人	FIDELITY FILMS LIMITED;FREDERICK KENNETH CROWTHER	发明人
分类号	G11B7/00;H01J17/40	主分类号	G11B7/00
代理机构		代理人
主权项
地址

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