YKK on a zipper stands for Yoshida Kōgyō Kabushiki Kaisha

YKK on a zipper stands for Yoshida Kōgyō Kabushiki Kaisha
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The initials YKK stand for Yoshida Kōgyō Kabushiki Kaisha, meaning "Yoshida Manufacturing Shareholding Company". YKK produces fasteners and architectural products at 109 YKK companies in 71 countries around the world.[2] @Curionic

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