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A zipper is not a gear.
They hook things together by force and they both make noise.
Well, the zipper was invented in 1913.Well, the zipper was invented in 1913.Well, the zipper was invented in 1913.Well, the zipper was invented in 1913.Well, the zipper was invented in 1913.Well, the zipper was invented in 1913.
yes a zipper is a lever because the back part of the zipper is the fuclcrum