System and apparatus for recording and reproducing sound,申请号US19310520956-传众专利搜索

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发明名称	System and apparatus for recording and reproducing sound
摘要
申请公布号	US2031865(A)	申请公布日期	1936.02.25
申请号	US19310520956	申请日期	1931.03.07
申请人	RADIO CORPORATION OF AMERICA	发明人	THOMAS ADOLPH A.
分类号	G11B3/46	主分类号	G11B3/46
代理机构		代理人
主权项
地址

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