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Detachable glasses

by DU YUEJIN
Year of Publication 26.04.2022
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Patent

Glasses frame

by DU YUEJIN
Year of Publication 26.04.2022
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Patent

Antiskid glasses

by DU YUEJIN
Year of Publication 26.04.2022
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Patent

Belt sander

by LIN HUACHENG, DU YUEJIN
Year of Publication 16.06.2023
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Patent