1995.2 , TOIN ENVIRONMENTAL DESIGN established
  , Licensed as a Specialty Contractor for indoor construction
  , Registered on Korea Specialty Contractor Financial Cooperative
  , Listed on COEX Venue Association
  , Designated as an official contractor of COEX
 
 
1999.2 , A subsidiary company founded - ZERO COMMUNICATIONS
 
2000.4 , TOIN & ZERO merged into a corporation,
  , TOIN ENVIRONMENTAL DESIGN
 
2001.1 , A membership of Korea Convention & Event Cooperative
  , Reappointed as an official contractor of COEX
  , Korean representative of NIMLOK
  , Registered on Daegu World Trade Center
  , Designated on Seoul Trade Exhibition Center
    , Listed on Busan Exhibition & Convention Center
    , A membership of Korea Exhibition Industry Cooperative