Input and output amplifying unit,申请号US19250069277-传众专利搜索

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发明名称	Input and output amplifying unit
摘要
申请公布号	US1748225(A)	申请公布日期	1930.02.25
申请号	US19250069277	申请日期	1925.11.16
申请人	HOCH EDWARD G;WALLIN JOEL L	发明人	HOCH EDWARD G.;WALLIN JOEL L.
分类号	H04R1/30	主分类号	H04R1/30
代理机构		代理人
主权项
地址

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