material for the rechenunterricht on first grade elementary school.

• 1. 一种单橡胶显示负荷小学一年级书包 [P] . 中国专利： CN202664527U . 2013.01.16
• 2. 一种双橡胶显示负荷小学一年级书包 [P] . 中国专利： CN202664524U . 2013.01.16
• 3. material, in particular for elementary rechenunterricht. [P] . AT93956B . 1923-08-25

  机译： 材料，特别是对于基本要求不高的材料。

• 4. teaching material for the elementary rechenunterricht. [P] . 瑞士专利： CH92597A . 1922-01-16

  机译： 初级rechenunterricht的教材。

• 5. teaching material for the elementary rechenunterricht. [P] . 瑞士专利： CH90496A . 1921-09-01

  机译： 初级rechenunterricht的教材。

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• 7. Educating Scientists and Engineers: Grade School to Grad School. Elementary and Secondary Education. Contractor Documents [R] . Fullilove, R. E. , Lee, V. E. 1988

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