Improvements in and relating to sound recording apparatus,申请号GB19380014402-传众专利搜索

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发明名称	Improvements in and relating to sound recording apparatus
摘要
申请公布号	GB503375(A)	申请公布日期	1939.04.05
申请号	GB19380014402	申请日期	1938.05.13
申请人	KARL DANIEL	发明人
分类号	G11B3/00	主分类号	G11B3/00
代理机构		代理人
主权项
地址

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