An improved visible card index,申请号GB19380011881-传众专利搜索

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发明名称	An improved visible card index
摘要
申请公布号	GB497538(A)	申请公布日期	1938.12.21
申请号	GB19380011881	申请日期	1938.04.20
申请人	FRED DUDLEY BRANGHAM	发明人
分类号	B42F17/18	主分类号	B42F17/18
代理机构		代理人
主权项
地址

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