Electromagnetic sound reproducer,申请号US19290344941-传众专利搜索

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发明名称	Electromagnetic sound reproducer
摘要
申请公布号	US1830401(A)	申请公布日期	1931.11.03
申请号	US19290344941	申请日期	1929.03.07
申请人	MIESSNER INVENTIONS INC.	发明人	MIESSNER BENJAMIN F.
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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