Electrodynamic recording head,申请号US19470770368-传众专利搜索

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发明名称	Electrodynamic recording head
摘要
申请公布号	US2514379(A)	申请公布日期	1950.07.11
申请号	US19470770368	申请日期	1947.08.25
申请人	DOUGLASS JR CHARLES R	发明人	JR. CHARLES R. DOUGLASS,
分类号	H04R11/08	主分类号	H04R11/08
代理机构		代理人
主权项
地址

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