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Safe schoolbag

by LI YANGYUE
Year of Publication 01.01.2019
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Patent

Special broom

by LI YANGYUE
Year of Publication 01.01.2019
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Patent

A bowl

by LI YANGYUE
Year of Publication 01.01.2019
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Patent

Eraser

by LI YANGYUE
Year of Publication 01.01.2019
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Patent