a slide rule for the teaching of mathematics in primary school

• 1. 一种小学数学教学装置及组件 [P] . 中国专利： CN113990115A . 2022-01-28
• 2. 一种小学数学教学用具 [P] . 中国专利： CN215814693U . 2022-02-11
• 3. NEW METHOD OF TEACHING MATHEMATICS FOR SCHOOL CHILDREN OF PRIMARY SCHOOL [P] . GR63259B . 1979-10-16

  机译： 小学儿童数学教学的新方法

• 4. teaching materials to facilitate the teaching of mathematics in primary school. [P] . BE610108A . 1962-03-01

  机译： 促进小学数学教学的教材。

• 5. Wood beads cords as illustrate means for the mathematics under straightening of the primary school or in addition to use various teaching [P] . 德国专利： DE29503280U1 . 1995-06-22

  机译： 木珠帘线作为小学数学矫正或除使用各种教学方法外的数学说明方法

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