Improvements in apparatus for recording and reproducing sound,申请号GB19470012342-传众专利搜索

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发明名称	Improvements in apparatus for recording and reproducing sound
摘要
申请公布号	GB628898(A)	申请公布日期	1949.09.07
申请号	GB19470012342	申请日期	1947.05.07
申请人	ALFRED GEORGE DE QUERVAIN COLLEY;THERMIONIC PRODUCTS LIMITED	发明人
分类号	G11B27/34	主分类号	G11B27/34
代理机构		代理人
主权项
地址

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