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| 2023 | 05. | Performance-sharing company certification / Ministry of SMEs and Startups |
| 06. | Material, Parts, and Equipment Company Certification / Korea Institute for Industrial Technology Evaluation | |
| 06. | Establishment of a research and development department (establishment of a research institute affiliated with a company) | |
| 07. | Management Innovation Company Main Biz Certification / Ministry of SMEs and Startups | |
| 12. | Designation of special medical history enterprises |
| 2019 | 11. | Registration of Hyundai/Kia Motors Co., Ltd. as a partner |
| 2016 | 10. | Entry into overseas markets (Japan) / Export items: Body jig equipment and processing equipment |
| 2014 | 06. | Relocation of new factory in Oedongmunsan General Industrial Complex in Gyeongju |
| 08. | Change of name of STI Co., Ltd | |
| 11. | Registration of Gyeongju-si's own factory |
| 2011 | 09. |
Registered as a partner of HYUNDAI WIA CORP. |
| 11. | Acquisition of quality management ISO9001 certification (Korea Quality Guarantee Service) |
| 2010 | 04. | Certification of venture companies |
| 2009 | 06. |
Established STI Heavy Industries Co., Ltd. (located in Yeocheon-dong, Nam-gu, Ulsan) |
| 07. | Starting production of automation jig facilities for the body | |
| 11. | Starting production of steel facilities / 50ton CRANE, hot rolled steel sheet feeder |