Improvements in and relating to the selective transmission of sound waves to microphones,申请号GB19310001525-传众专利搜索

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发明名称	Improvements in and relating to the selective transmission of sound waves to microphones
摘要
申请公布号	GB371031(A)	申请公布日期	1932.04.18
申请号	GB19310001525	申请日期	1931.01.16
申请人	BRITISH ACOUSTIC FILMS LIMITED;OTTO KURT KOLB	发明人
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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