Improvements in apparatus for the conversion of electrical signals into sound,申请号GB19300018168-传众专利搜索

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发明名称	Improvements in apparatus for the conversion of electrical signals into sound
摘要
申请公布号	GB354467(A)	申请公布日期	1931.08.13
申请号	GB19300018168	申请日期	1930.06.13
申请人	THE GENERAL ELECTRIC COMPANY LIMITED;DONALD ARTHUR OLIVER	发明人
分类号	H04R3/14	主分类号	H04R3/14
代理机构		代理人
主权项
地址

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