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1984 - 1990
- established Sole Proprietorship in 1984
- selected as a prominent subcontractor to SAMSUNG C&T
- obtained a quality guarantee (onyx marble bathtub)
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1991 - 2000
- established SAMHYUN SYNTHESIS CO., LTD.
- constructed a factory in Jinchon
- exported bathtubs to MATSUSHITA ELECTRIC WORKS PTE.,LTD in Japan
- first-ever invented HIGHSTONE & GRANISTONE in South Korea
- registered a trademark of HIGHSTONE
- got a utility model right(97-10898) for freestanding bathtub
- got a KS mark (Korea Standard) of bathtub
- got a patent for marble and ceramic
- commended a model taxpayer by the Office of National Tax Administration
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2001 - 2004
- commended a prominent subcontractor by DAELIM
- got a patent for a manufacturing process about artificial ceramics in a particular coating way
- got a utility model right for washbasin
- certified Quality Management Systems (ISO 9001:2000 / KS A 9001:2001)
- listed as a prominent subcontractor to imarketKorea
- passed a test of Chemical resistance by Korea Testing and Research Institute for Chemical Industry
- commended a man of merit about medium-sized enterprises by Ministry of Commerce Industry and Energy
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2005 - 2010
- listed as a prominent subcontractor to imarketKorea
- got a plaque of thanks by DAELIM
- selected as GOOD DESIGN by Korea Institute of Design Promotion (LT07-001, BTM09-001)
- listed as a subcontractor of construction to SAMSUNG C&T
- listed as a prominent subcontractor to POSCO E&C
- participated in Kyunghyang Housing Fair & Housing Brand Fair (2006~2010)
- commended a model taxpayer by the Office of Chung-Ju Tax Office
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2011 - 2023
- participated in Housing Brand Fair (2011~2014)
- selected as a prominent subcontractor to POSCO E&C
- selected as a subcontractor of construction to SAMSUNG C&T
- got a plaque of thanks by DAELIM
- awarded 'WINNER' by IF DESIGN AWARD in 2012 (LT11-003)
- selected as GOOD DESIGN by Korea Institute of Design Promotion (BTM14-001)
- registered a trademark of GRANISTONE
- listed as a subcontractor to HYUNDAI E&C, DAEWOO E&C and LOTTE E&C
- listed as a subcontractor to GS E&C, HANWHA E&C
- awarded 'WINNER' by K-DESIGN AWARD in 2021 (UNIVERSAL PUBLIC BASIN)
- awarded 'WINNER' by GOOD DESIGN SELECTION in 2022 (BASIN "EAVE")