Directional acoustic system,申请号US19490114319-传众专利搜索

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发明名称	Directional acoustic system
摘要
申请公布号	US2580439(A)	申请公布日期	1952.01.01
申请号	US19490114319	申请日期	1949.09.07
申请人	BELL TELEPHONE LABORATORIES, INCORPORATED	发明人	KOCK WINSTON E.
分类号	H04R1/34	主分类号	H04R1/34
代理机构		代理人
主权项
地址

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