Coupling for telephone receivers and hearing aid sets,申请号US19480035893-传众专利搜索

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发明名称	Coupling for telephone receivers and hearing aid sets
摘要
申请公布号	US2554834(A)	申请公布日期	1951.05.29
申请号	US19480035893	申请日期	1948.06.29
申请人	BELL TELEPHONE LABORATORIES, INCORPORATED	发明人	LAVERY GRANT G.
分类号	H04R25/04	主分类号	H04R25/04
代理机构		代理人
主权项
地址

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