Membrane composite pour carters microphoniques de phonographes,申请号FRD713413-传众专利搜索

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发明名称	Membrane composite pour carters microphoniques de phonographes
摘要
申请公布号	FR713413(A)	申请公布日期	1931.10.27
申请号	FRD713413	申请日期	1931.03.17
申请人		发明人	GREPPERT WALTER
分类号	H04R7/02	主分类号	H04R7/02
代理机构		代理人
主权项
地址

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