Improvements in sound transmitting devices,申请号GB19510001774-传众专利搜索

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发明名称	Improvements in sound transmitting devices
摘要
申请公布号	GB690889(A)	申请公布日期	1953.04.29
申请号	GB19510001774	申请日期	1951.01.23
申请人	"MULTIMOTEUR" S.A.	发明人
分类号	G10K11/28;H04R1/34	主分类号	G10K11/28
代理机构		代理人
主权项
地址

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