zipper

Supplementary Material

The zipper is a common connection device that connects and separates the toothed belt. The invention of the zipper greatly facilitates the opening and closing of clothing, backpacks, tents and other items, improving convenience.

The zipper is a common connection device that connects and separates the toothed belt. The invention of the zipper greatly facilitates the opening and closing of clothing, backpacks, tents and other items, improving convenience.

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