• Chiyoda Corporation 
• IHI Corporation
  
• JFE Engineering Corporation
• JFE Project One Co.,Ltd. 
• JGC Corporation  
  
• JGC Japan Corporation 
• Kawasaki Heavy Industries, Ltd. 
  
• Kobe Steel, Ltd. 
  
• MHI Power Engineering Co.,Ltd.
• Mitsubishi Heavy Industries, Ltd. 
• Mitsubishi Heavy Industries Transportation and Construction Engineering, Ltd.
• Mitsubishi Heavy Industries Environmental ＆ Chemical Engineering Co.,Ltd. 
• Nippon Steel Pipeline & Engineering Co.,Ltd.
• Toshiba Energy Systems & Solutions Corporation
• Toyo Engineering Corporation  
  
• etc.
  

(In alphabetical order)