System of column headings,申请号US19300489761-传众专利搜索

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发明名称	System of column headings
摘要
申请公布号	US1801031(A)	申请公布日期	1931.04.14
申请号	US19300489761	申请日期	1930.10.20
申请人	WILSON HERBERT R	发明人	WILSON HERBERT R.
分类号	G09F7/00	主分类号	G09F7/00
代理机构		代理人
主权项
地址

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