Portable public address system,申请号US19490118900-传众专利搜索

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发明名称	Portable public address system
摘要
申请公布号	US2572221(A)	申请公布日期	1951.10.23
申请号	US19490118900	申请日期	1949.09.30
申请人	VOIGT ROBERT H	发明人	VOIGT ROBERT H.
分类号	H04R27/00	主分类号	H04R27/00
代理机构		代理人
主权项
地址

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