A device for the teaching of elementary principles of the geometry of the flat surfaces

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• 2. 包含用于教授专业计算器的教育装置的书及使用该书的金融培训模拟方法 [P] . 中国专利： CN101990679A . 2011-03-23
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  机译： 用于基本算术和几何学教学的教材，以及以功能上适当的方式表示质量并与实际使用的定向zaehlkoerpern对齐的教材

• 4. A device for the teaching of concepts of the geometry of the elementary [P] . 法国专利： FR1338973A . 1963-10-04

  机译： 一种用于教授基本几何概念的设备

• 5. Improvement in Making Models of Transparent Material for Teaching and Studying Solid Geometry and its Principles. [P] . 英国专利： GB190316340A . 1903-09-03

  机译： 改进用于教学和研究实体几何的透明材料模型及其原理。

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