Japan International Corporation Agency (JICA)
  
  Japan Society of Civil Engineers
  
  The Institution of Professional Engineers, Japan (IPEJ)
  
  Japan Road Association
  
  Japan Concrete Institute
  
  Express Highway Research Foundation of Japan (Japanese)
  
  Geological Survey Fnterprises Association ,Kanto (Japanese)
  
  Kanagawa Prefecture Measurement Society (Japanese)
  
  Yokohama water business conference (Japanese)
  
  
  

Guide of Group To Which Our Company Belongs