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The zipper consists of two continuously arranged strips with gears, one is the rack on the right and the other is the rack on...
07-06
Zippers first appeared in 1893 AD, at the Chicago World's Fair held in New York, USA. At that time, the zipper was invent...
A zipper is a device used to connect two pieces of fabric for easy opening and closing. In clothing, bags, shoes and other pr...
Invisible zipper is a kind of zipper that is not easy to detect. It is commonly used in clothes, bags and other items. It is ...
