Improvements made to the means and devices intended to the teaching of the first elements of the calculation to children

• 1. 引导儿童第一步的改进装置 [P] . 中国专利： CN201253038Y . 2009.06.10
• 2. 一种能够实现在第一通信网络中改进的效率的方法、网络实体、网络装置、计算机程序和计算机程序产品 [P] . 中国专利： CN109417693A . 2019-03-01
• 3. Improvements made to the means and devices intended to the teachings of the first elements of the calculation to children [P] . 法国专利： FR71836E . 1960-02-01

  机译： 改进了旨在向儿童进行计算的第一要素的教学的手段和装置

• 4. The device of the table to the mobile elements intended to the teaching of reading, writing, orthography, and calculation [P] . 法国专利： FR428186A . 1911-08-24

  机译： 桌子上用于移动元素的设备，旨在进行阅读，书写，正字法和计算的教学

• 5. Improvements to the devices or apparatuses, intended to serve to the teaching of children [P] . 法国专利： FR518191A . 1921-05-20

  机译： 旨在服务于儿童的设备或装置的改进

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