Double diaphragm loud-speaker,申请号US19450592591-传众专利搜索

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发明名称	Double diaphragm loud-speaker
摘要
申请公布号	US2496589(A)	申请公布日期	1950.02.07
申请号	US19450592591	申请日期	1945.05.08
申请人	OPERADIO MANUFACTURING CO.	发明人	MARQUIS JOHN FIRTH
分类号	H04R1/24	主分类号	H04R1/24
代理机构		代理人
主权项
地址

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