Sound pick-up and amplifying apparatus,申请号US19340741518-传众专利搜索

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发明名称	Sound pick-up and amplifying apparatus
摘要
申请公布号	US2145449(A)	申请公布日期	1939.01.31
申请号	US19340741518	申请日期	1934.08.25
申请人	LOCKHART MARSHALL L	发明人	LOCKHART MARSHALL L.
分类号	H04R17/02	主分类号	H04R17/02
代理机构		代理人
主权项
地址

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