Improvements in or relating to loud speakers,申请号GB19480014981-传众专利搜索

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发明名称	Improvements in or relating to loud speakers
摘要
申请公布号	GB631861(A)	申请公布日期	1949.11.10
申请号	GB19480014981	申请日期	1947.06.14
申请人	JOHN FORRESTER	发明人
分类号	H04R1/28	主分类号	H04R1/28
代理机构		代理人
主权项
地址

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