Improvements in or relating to acoustic resistance devices such as may be used, for example, in gramophones,申请号GB19280026958-传众专利搜索

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发明名称	Improvements in or relating to acoustic resistance devices such as may be used, for example, in gramophones
摘要
申请公布号	GB310493(A)	申请公布日期	1930.01.20
申请号	GB19280026958	申请日期	1928.09.20
申请人	ELECTRICAL RESEARCH PRODUCTS, INC.	发明人
分类号	G10K11/168	主分类号	G10K11/168
代理机构		代理人
主权项
地址

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