Sound-propagating device,申请号US19540426106-传众专利搜索

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发明名称	Sound-propagating device
摘要
申请公布号	US2871971(A)	申请公布日期	1959.02.03
申请号	US19540426106	申请日期	1954.04.28
申请人	BEECROFT ROBERT J;FENTON EDWARD N	发明人	BEECROFT ROBERT J.;FENTON EDWARD N.
分类号	H04R1/28	主分类号	H04R1/28
代理机构		代理人
主权项
地址

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