Control device for hearing aids and the like,申请号US19380235932-传众专利搜索

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发明名称	Control device for hearing aids and the like
摘要
申请公布号	US2267489(A)	申请公布日期	1941.12.23
申请号	US19380235932	申请日期	1938.10.20
申请人	BROCKHURST JAMES B	发明人	BROCKHURST JAMES B.
分类号	H04R25/00	主分类号	H04R25/00
代理机构		代理人
主权项
地址

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