Improvements in frames for transparencies,申请号GB19570016873-传众专利搜索

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发明名称	Improvements in frames for transparencies
摘要
申请公布号	GB820757(A)	申请公布日期	1959.09.23
申请号	GB19570016873	申请日期	1957.05.28
申请人	ERICH LIEBNITZ	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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