Improvements in or relating to sound recording,申请号GB19390008875-传众专利搜索

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发明名称	Improvements in or relating to sound recording
摘要
申请公布号	GB526567(A)	申请公布日期	1940.09.20
申请号	GB19390008875	申请日期	1939.03.20
申请人	RADIO CORPORATION OF AMERICA	发明人
分类号	G11B7/00	主分类号	G11B7/00
代理机构		代理人
主权项
地址

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