• Fab-Tec Japan Corporation.
  • Hitachi Zosen Corporation
  • HORK Corporation
  • IHI Infrastructure Systems Co., Ltd.
  • IHI Infrastructure Systems Co., Ltd.
  • Izumi Construction Industry Co., Ltd.
  • JFE Engineering Corporation
  • KAJIMA CORPORATION
  • Kawada Kogyo Co., Ltd.
  • KFC Ltd.
  • Kurimoto,Ltd.
  • MARSIMA AQUA SYSTEM CORP.
  • MIYAWAKI KOKAN CO.,LTD.
  • NIPPON STEEL ENGINEERING CO., LTD.
  • NIPPON STEEL KOBELCO METAL PRODUCTS CO.,LTD
  • NIPPON STEEL TRADING CORPORATION
  • OKUMURA CORPORATION
  • Onoken Co., Ltd.
  • SAKAI IRON WORKS CO. LTD.,
  • SANEI KOZAI CO.,LTD.
  • SHO-BOND CORPORATION
  • TAKADAKIKO Co.,Ltd
  • YAMAZAKI Co., Ltd.