1946
January YKK® registered as a trademark of Yoshida Kogyo K.K.
January YKK® registered as a trademark of Yoshida Kogyo K.K.
August Uozu Tekkousho K.K. purchased by Yoshida Kogyosho. Renamed Yoshida Kogyo K.K.
May Komatsugawa Plant burned down in the Great Tokyo Air Raids; Yoshida Kogyosho temporarily
February Yoshida Kogyosho reorganized as a limited company.