Appliance for correcting examination papers,申请号US19470724491-传众专利搜索

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发明名称	Appliance for correcting examination papers
摘要
申请公布号	US2528828(A)	申请公布日期	1950.11.07
申请号	US19470724491	申请日期	1947.01.27
申请人	HENRY AUSTIN L	发明人	HENRY AUSTIN L.
分类号	G06K17/00	主分类号	G06K17/00
代理机构		代理人
主权项
地址

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