Improvements in sound amplifiers for talking machines,申请号GB19320005973-传众专利搜索

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发明名称	Improvements in sound amplifiers for talking machines
摘要
申请公布号	GB395076(A)	申请公布日期	1933.07.13
申请号	GB19320005973	申请日期	1932.02.29
申请人	JOHN CHALMERS	发明人
分类号	G10K13/00	主分类号	G10K13/00
代理机构		代理人
主权项
地址

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