Apparatus for transforming sound into electrical energy,申请号US19270232701-传众专利搜索

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发明名称	Apparatus for transforming sound into electrical energy
摘要
申请公布号	US1749284(A)	申请公布日期	1930.03.04
申请号	US19270232701	申请日期	1927.11.11
申请人	HAYES HARVEY C	发明人	HAYES HARVEY C.
分类号	H04R9/08	主分类号	H04R9/08
代理机构		代理人
主权项
地址

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