发明名称 Basic educational system
摘要 An educational system is provided including a recipient surface such as a cloth or base having a plurality of entities positioned thereon which are selected from the group of entities including colors, shapes, alphabetic characters, and numbers. Also included are marbles and figurines for being removably positioned adjacent to the entities.
申请公布号 US6030228(A) 申请公布日期 2000.02.29
申请号 US19990252111 申请日期 1999.02.18
申请人 ARMSTRONG, THALIA I. 发明人 ARMSTRONG, THALIA I.
分类号 A47B37/00;B65F1/14;G09B1/08;G09B17/00;G09B19/12;(IPC1-7):G09B19/12 主分类号 A47B37/00
代理机构 代理人
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