Electrical sound reproducing process,申请号US19210435983-传众专利搜索

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发明名称	Electrical sound reproducing process
摘要
申请公布号	US1816360(A)	申请公布日期	1931.07.28
申请号	US19210435983	申请日期	1921.01.08
申请人	RADIO CORPORATION OF AMERICA	发明人	CAWLEY ALOYSIUS J.
分类号	G11B11/00	主分类号	G11B11/00
代理机构		代理人
主权项
地址

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