Improvements in frames or holders for transparencies to be viewed or optically projected,申请号GB19390004477-传众专利搜索

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发明名称	Improvements in frames or holders for transparencies to be viewed or optically projected
摘要
申请公布号	GB524949(A)	申请公布日期	1940.08.19
申请号	GB19390004477	申请日期	1939.02.10
申请人	HEINRICH LOEBSTEIN	发明人
分类号	G03B21/64	主分类号	G03B21/64
代理机构		代理人
主权项
地址

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