Characters device, at the same time as the one another - and teaching aid for the mathematics under directional.

• 1. 一种数学教学中专用的教具 [P] . 中国专利： CN214012294U . 2021-08-20
• 2. 一种数学教学中专用的教具 [P] . 中国专利： CN204196535U . 2015.03.11
• 3. Teaching aid for the mathematics under directional. [P] . 德国专利： DE1834254U . 1961-07-06

  机译： 定向下的数学教具。

• 4. Teaching aid for the technical characters at directional. [P] . 德国专利： DE1891192U . 1964-04-16

  机译： 定向技术字符的教具。

• 5. Teaching aid for the technical characters at directional. [P] . 德国专利： DE1892828U . 1964-05-14

  机译： 定向技术字符的教具。

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