| 1985.03 | Founded THRU Lab & Engineering | |
| 1985.03 | Korea Agent (FCC, IC) of Timco Engineering, Inc. (U.S.A) | |
| 1986.01 | Korea Agent (CE-mark) of PKM Electronic GmbH. (Germany) | |
| 1991.09 | Korea Agent (UL, CSA, ETL) of Marstech Lmited (Canada) | |
| 1991.10 | FCC Listed Facility (Part 15/18) : Icheon, Korea | |
| 1992.02 | RRL Designated Test Organization (EMI, 3m) | |
| 1993.08 | Moved to Hwaseong, Gyeonggi-do, Korea | |
| RRL Designated Test Organization (EMI, 3/10m) | ||
| FCC Listed Facility (Part 15/18, 3/10m) | ||
| 2003.11 | IC Registered OAT | |
| 2005.12 | Moved to Yeoju, Gyeonggi-do, Korea | |
| RRL Designated Test Organization (Radio, EMI, 3/10m) | ||
| FCC, IC Listed test lab. | ||
| 2008.08 | Changed company name to THRU-KES Co., Ltd | |
| Opened Anyang office(HQ) & RF test lab. : Anyang, Gyeonggi-do, Korea | ||
| 2009.09 | Japan TELEC accredited testlab. (by TUV-SUD Ohtama) | |
| 2009.12 | Korea RRA designation to the added scopes : EMI, EMS, Radio, Safety, FCC accredited test lab(MRA) | |
| 2010.09 | Changed company name to KES Co., Ltd. | |
| 2011.07 | Korea ILAC/KOLAS accredited test lab. | |
| 2012.03 | CSA accredited test lab for witness testing | |
| 2012.05 | Equipped Raliability (Environmetal) facilities at Yeoju site. | |
| 2012.12 | Added a designated SAR scope for KC testing | |
| 2013.08 | Expansion of EMC facilities at Yeoju site: two 10m OATS, one 3m EMI chamber, two 3m EMC chambers, two shield rooms | |
| 2013.10 | Completion of RF/SAR, Safety facilities at Anyang HQ. | |
