Improvements in and relating to electro-acoustical transducers,申请号GB19570024128-传众专利搜索

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发明名称	Improvements in and relating to electro-acoustical transducers
摘要
申请公布号	GB851368(A)	申请公布日期	1960.10.12
申请号	GB19570024128	申请日期	1957.07.30
申请人	PHILCO CORPORATION	发明人
分类号	H04R19/00	主分类号	H04R19/00
代理机构		代理人
主权项
地址

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