A sandbox for playing for children

• 1. 一种儿童玩沙玩泥用的塑料模具 [P] . 中国专利： CN201533996U . 2010.07.28
• 2. 儿童木玩益智桌 [P] . 中国专利： CN215603916U . 2022-01-25
• 3. sandbox, especially for children's playground [P] . 德国专利： DE29713520U1 . 1997-12-18

  机译： 沙盒，特别是用于儿童游乐场

• 4. A sandbox, in particular for children's playground [P] . 德国专利： DE29713520U1 . 1997-11-06

  机译： 沙盒，特别是用于儿童游乐场

• 5. A sandbox as children's playground. [P] . 德国专利： DE1921715U . 1965-08-19

  机译： 沙盒作为儿童游乐场。

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• 6. Playing nice in the sandbox: On the role of heterogeneity, trust and cooperation in common-pool resources [O] . Fijnanda van Klingeren 2020

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