Synchronous-motor-driven phonograph,申请号US19280322497-传众专利搜索

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发明名称	Synchronous-motor-driven phonograph
摘要
申请公布号	US1781577(A)	申请公布日期	1930.11.11
申请号	US19280322497	申请日期	1928.11.28
申请人	GENERAL ELECTRIC COMPANY	发明人	HALL CHESTER I.
分类号	G11B17/00	主分类号	G11B17/00
代理机构		代理人
主权项
地址

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