- 
            2017
              
				- 2017. 02 Electronic board, Traffic information board direct producing
- 2017. 05 Announce system, Access control system
 
 
- 
            2016
              
                - 2016. 03 Bus and traffic guide apparatus direct producing
 
 
- 
            2015
              																		   
                - 2015. 02 Software development direct producing
- 2015. 11 Imagery sensing direct producing
- 2015. 12 Combined lathe direct producing
 
 
- 
            2014
              
                - 2014. 05 Licensing electricity business
 
 
- 
            2012
              
				- 2012. 06 Establish a Co, Ltd Deahan Information communication
- 2012. 11 Licensing information communication engineering
 
 
- 
            2011
              
                - 2011. 11 Licensing ISO 10004 
 
 
- 
            2003
              
                - 2003. 01 Co, Ltd KT - Jeonnam cooperation railroad construction
 
 
- 
            2001
              
                - 2001. 03 Joining Electronics Industries Association of Korea
 
 
- 
            1999
              																		   
                - 1999. 06 Joining Korea metal industry cooperative
- 1999. 09 Licensing ISO 9001
- 1999. 10 Licensing software business
- 1999. 10 Change the company name to Deahan information communication
 
 
- 
            1997
              
                - 1997. 12 Licensing information communication business
 
 
- 
            1995
              
				- 1995. 12 Founding Deahan Telecom
- 1995. 10 Licensing from the Ministry of Information and Communication