Improvements in electrical sound recording and reproducing apparatus,申请号GB19500005951-传众专利搜索

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发明名称	Improvements in electrical sound recording and reproducing apparatus
摘要
申请公布号	GB650809(A)	申请公布日期	1951.03.07
申请号	GB19500005951	申请日期	1947.12.23
申请人	ADRIAN FRANCIS SYKES	发明人
分类号	H04R15/00	主分类号	H04R15/00
代理机构		代理人
主权项
地址

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