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Des Reg
  
Concrete Sleeper for turnout of railroad
   제30-0455122   제2006-0014140   2007.06.29
Des Reg
  
Wide sleeper
   제30-0426544   제2005-0041224   2006.09.25
Des Reg
  
Connection pin of tunnel segment
   제30-0325748   제2002-0004516   2003.05.27