Magnetic insert earphone and inserts therefor,申请号US19520270391-传众专利搜索

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发明名称	Magnetic insert earphone and inserts therefor
摘要
申请公布号	US2808468(A)	申请公布日期	1957.10.01
申请号	US19520270391	申请日期	1952.02.07
申请人	SONOTONE CORPORATION	发明人	KNAUERT WILLIAM F.
分类号	H04R11/06;H04R25/02	主分类号	H04R11/06
代理机构		代理人
主权项
地址

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