Bone conduction hearing aid unit,申请号US19490078364-传众专利搜索

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发明名称	Bone conduction hearing aid unit
摘要
申请公布号	US2681389(A)	申请公布日期	1954.06.15
申请号	US19490078364	申请日期	1949.02.25
申请人	DYNA-LABS, INC.	发明人	SHAPER HARRY B.
分类号	H04R11/00	主分类号	H04R11/00
代理机构		代理人
主权项
地址

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