■WISEHOLDINGS CORPORATION
https://wiseholdings.co.jp/
■YAMASHINA CORPORATION
http://www.kk-yamashina.co.jp/index.html
■SANYO INDUSTRY CORPORATION
http://www.sanyo-ind.co.jp/index.html
■YAMAZOE-SS CORPORATION
http://www.yamazoe-ss.co.jp/
■CHUGOKU YAMASHINA SERVICE CORPORATION
http://www.cys-kk.co.jp/
■YAMAYA electronics CORPORATION
https://yamaya-electronics.com/
