Radio loud-speaker,申请号US19290358805-传众专利搜索

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发明名称	Radio loud-speaker
摘要
申请公布号	US1787268(A)	申请公布日期	1930.12.30
申请号	US19290358805	申请日期	1929.04.29
申请人	BRYAN GROOM	发明人	GROOM BRYAN
分类号	H04R9/06	主分类号	H04R9/06
代理机构		代理人
主权项
地址

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