Question: are all zippers made by ykk?
Answer: The YKK stands for Yoshida Kogyo Kabushikikaisha (say that five times fast). In 1934 Tadao Yoshida founded Yoshida Kogyo Kabushikikaisha (translated Yoshida Industries Limited). This company is now the world's foremost zipper manufacturer, making about 90% of all zippers in over 206 facilities in 52 countries.