Improvements in or relating to electrical phonograph reproducers,申请号GB19310028827-传众专利搜索

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发明名称	Improvements in or relating to electrical phonograph reproducers
摘要
申请公布号	GB391139(A)	申请公布日期	1933.04.18
申请号	GB19310028827	申请日期	1931.10.16
申请人	ELECTRICAL RESEARCH PRODUCTS INC.	发明人
分类号	H04R1/16;H04R9/12	主分类号	H04R1/16
代理机构		代理人
主权项
地址

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