Improvements in and relating to sound reproducing devices,申请号GB19380024722-传众专利搜索

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发明名称	Improvements in and relating to sound reproducing devices
摘要
申请公布号	GB519625(A)	申请公布日期	1940.04.02
申请号	GB19380024722	申请日期	1938.08.23
申请人	GUY R. FOUNTAIN LIMITED;HENRY JOHN HOULGATE	发明人
分类号	H04R1/30	主分类号	H04R1/30
代理机构		代理人
主权项
地址

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