Public address apparatus,申请号US19610107784-传众专利搜索

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发明名称	Public address apparatus
摘要
申请公布号	US3129782(A)	申请公布日期	1964.04.21
申请号	US19610107784	申请日期	1961.05.04
申请人	JAMES WILLIS HUGHES	发明人	STOWELL NATHAN J.
分类号	H04R1/28	主分类号	H04R1/28
代理机构		代理人
主权项
地址

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