Improvements in or relating to photographic sound recorders,申请号GB19410004540-传众专利搜索

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发明名称	Improvements in or relating to photographic sound recorders
摘要
申请公布号	GB546308(A)	申请公布日期	1942.07.07
申请号	GB19410004540	申请日期	1941.04.04
申请人	RADIO CORPORATION OF AMERICA	发明人
分类号	G11B7/003	主分类号	G11B7/003
代理机构		代理人
主权项
地址

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