Improvements in or relating to transducers,申请号GB19470008395-传众专利搜索

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发明名称	Improvements in or relating to transducers
摘要
申请公布号	GB639134(A)	申请公布日期	1950.06.21
申请号	GB19470008395	申请日期	1947.03.28
申请人	ELECTRICAL & MUSICAL INDUSTRIES LIMITED	发明人	SPEAR DONALD FREDERICK
分类号	H04R9/08	主分类号	H04R9/08
代理机构		代理人
主权项
地址

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