Improvements in or relating to acoustic diaphragms,申请号GB19290019040-传众专利搜索

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发明名称	Improvements in or relating to acoustic diaphragms
摘要
申请公布号	GB334641(A)	申请公布日期	1930.09.11
申请号	GB19290019040	申请日期	1929.06.20
申请人	VICTOR TALKING MACHINE COMPANY	发明人
分类号	H04R7/12	主分类号	H04R7/12
代理机构		代理人
主权项
地址

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