Electrostatic loud speaker,申请号US19290340370-传众专利搜索

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发明名称	Electrostatic loud speaker
摘要
申请公布号	US1850855(A)	申请公布日期	1932.03.22
申请号	US19290340370	申请日期	1929.02.16
申请人	THOMAS ADOLPH A	发明人	THOMAS ADOLPH A.
分类号	H04R19/02	主分类号	H04R19/02
代理机构		代理人
主权项
地址

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