Improvements in or relating to the production and reproduction of sound records,申请号GB19380037657-传众专利搜索

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发明名称	Improvements in or relating to the production and reproduction of sound records
摘要
申请公布号	GB523207(A)	申请公布日期	1940.07.09
申请号	GB19380037657	申请日期	1938.12.28
申请人	RADIO CORPORATION OF AMERICA	发明人
分类号		主分类号
代理机构		代理人
主权项
地址

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