Improvements in and relating to horn type loud speakers,申请号GB19380009209-传众专利搜索

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发明名称	Improvements in and relating to horn type loud speakers
摘要
申请公布号	GB513940(A)	申请公布日期	1939.10.26
申请号	GB19380009209	申请日期	1938.03.25
申请人	ALFRED AUGUSTUS THORNTON	发明人
分类号	H04R1/28	主分类号	H04R1/28
代理机构		代理人
主权项
地址

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