Perfectionnements apportés aux écrans et à leur procédé de fabrication, notamment en vue de les rendre perméables aux sons,申请号FRD731772-传众专利搜索

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发明名称	Perfectionnements apportés aux écrans et à leur procédé de fabrication, notamment en vue de les rendre perméables aux sons
摘要
申请公布号	FR731772(A)	申请公布日期	1932.09.08
申请号	FRD731772	申请日期	1932.02.24
申请人		发明人	ZECHMANEK KARL;WEISSMANN DAWID
分类号	G03B21/60	主分类号	G03B21/60
代理机构		代理人
主权项
地址

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