écran de projection,申请号FRD850274-传众专利搜索

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发明名称	écran de projection
摘要
申请公布号	FR850274(A)	申请公布日期	1939.12.12
申请号	FRD850274	申请日期	1939.02.14
申请人	OPTICOLOR AKTIENGESELLSCHAFT	发明人
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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