Sound recording apparatus,申请号US19290371289-传众专利搜索

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发明名称	Sound recording apparatus
摘要
申请公布号	US1829121(A)	申请公布日期	1931.10.27
申请号	US19290371289	申请日期	1929.06.15
申请人	VINSON ELLIOTT R	发明人	VINSON ELLIOTT R.
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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