Improvements in visible index card holders,申请号GB19310020688-传众专利搜索

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发明名称	Improvements in visible index card holders
摘要
申请公布号	GB375100(A)	申请公布日期	1932.06.23
申请号	GB19310020688	申请日期	1931.07.20
申请人	WILLIAM WARREN TRIGGS	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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