Improvements in or relating to audio frequency control systems for use in connectionwith sound pick-up systems and the like,申请号GB19380029158-传众专利搜索

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发明名称	Improvements in or relating to audio frequency control systems for use in connectionwith sound pick-up systems and the like
摘要
申请公布号	GB507826(A)	申请公布日期	1939.06.21
申请号	GB19380029158	申请日期	1938.10.07
申请人	MARCONI'S WIRELESS TELEGRAPH COMPANY LIMITED	发明人
分类号	H04R3/00	主分类号	H04R3/00
代理机构		代理人
主权项
地址

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