Magnetic sound recording system,申请号US19310526325-传众专利搜索

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发明名称	Magnetic sound recording system
摘要
申请公布号	US1886616(A)	申请公布日期	1932.11.08
申请号	US19310526325	申请日期	1931.03.30
申请人	ADDISON INVESTMENT COMPANY	发明人	ALVERSON JAMES G.
分类号	G11B5/03	主分类号	G11B5/03
代理机构		代理人
主权项
地址

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