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1. 发明授权

US5423682A Numbering system teaching aid 失效
标题翻译：编号系统教学辅助
公开(公告)号：US5423682A
公开(公告)日：1995-06-13
申请号：US184928
申请日：1994-01-24
申请人： Raymond E. Hildebrandt
发明人： Raymond E. Hildebrandt
IPC分类号： G09B1/14 , G09B19/02
CPC分类号： G09B19/02 , G09B1/14
摘要： A teaching aid for teaching young children counting in the tens numbering systems, in which four side by side stacks of nine blocks are each slidable on respective rods held in a frame, each of the nine blocks having one face of each block in the stack imprinted in order with a cardinal number, the blocks in the second, third, and fourth stacks also marked respectively with one, two, and three zeros to the left of the cardinal number appearing thereon. Each of the cardinal numbers on the blocks in each stack are in distinct colors, the zeros color matched to the color of the cardinal number of the corresponding place on the adjacent stack. The blocks in each stack are progressively sized wider to the left in proportion to the number of number and zero digits imprinted thereon.
摘要翻译：用于教导在数十个系统中计数的幼儿的教学辅助工具，其中四个并排堆叠的九个块都可以在保持在框架中的各个杆上滑动，九个块中的每一个都在堆叠中印有每个块的一个面按照基数，第二，第三和第四堆栈中的块也分别在出现在其上的基数的左侧标记有一个，两个和三个零。每个堆叠中的块上的每个基数都是不同的颜色，零的颜色与相邻堆叠上相应位置的基数的颜色相匹配。每个堆叠中的块按照与其上打印的数字和零数字的数量成比例地逐渐变宽到左侧。

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