Ear mounted hearing aid device,申请号US19550550642-传众专利搜索

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发明名称	Ear mounted hearing aid device
摘要
申请公布号	US2874231(A)	申请公布日期	1959.02.17
申请号	US19550550642	申请日期	1955.12.02
申请人	WALLACE FRANK B	发明人	WALLACE FRANK B.
分类号	H04R25/02	主分类号	H04R25/02
代理机构		代理人
主权项
地址

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