Sound reproducing device,申请号US19260101185-传众专利搜索

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发明名称	Sound reproducing device
摘要
申请公布号	US1822450(A)	申请公布日期	1931.09.08
申请号	US19260101185	申请日期	1926.04.10
申请人	UNITED RESEARCH CORPORATION	发明人	NYSTROM MARTIN
分类号	H04R1/38	主分类号	H04R1/38
代理机构		代理人
主权项
地址

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