Slide rule for primary school pupils to learn the basics of arithmetical subtraction and some addition facts

• 1. 能够支持加法和减法的加法器和支持加法和减法的方法 [P] . 中国专利： CN103970503B . 2019.03.01
• 2. 能够支持加法和减法的加法器和支持加法和减法的方法 [P] . 中国专利： CN103970503A . 2014-08-06
• 3. Slide rule for primary school pupils to learn the basics of arithmetical subtraction and some addition facts [P] . 英国专利： GB9904325D0 . 1999-04-21

  机译： 小学生的计算尺学习算术减法的基本知识和一些加法事实

• 4. Slide rule for primary school pupils to learn the basics of arithmetical subtraction and some addition facts [P] . 英国专利： GB9804255D0 . 1998-04-22

  机译： 小学生的计算尺学习算术减法的基本知识和一些加法事实

• 5. Simple slide-rule for teaching basic arithmetic - has linear graduated scales for elementary addition and subtraction [P] . 德国专利： DE2526563A1 . 1976-12-30

  机译： 用于计算基本算术的简单幻灯片规则-具有用于基本加法和减法的线性刻度尺

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