Sound-amplifying apparatus,申请号US19280245618-传众专利搜索

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发明名称	Sound-amplifying apparatus
摘要
申请公布号	US1802480(A)	申请公布日期	1931.04.28
申请号	US19280245618	申请日期	1928.01.09
申请人	ROGERS HARRISON W	发明人	ROGERS HARRISON W.
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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