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| ㆍ1998 March |
Founded as Sunggok Engineering |
ㆍ1998 December
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Certified as a registered company |
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| ㆍ2001 January |
Registration of Ministry of Defence Procurement Company |
ㆍ2001 February
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Establishment of a Corporate Extension Research Center |
| ㆍ2002 September |
Change of the company name from Sunggok Engineering to Sunggok Nano Tec., Ltd. |
ㆍ2002 October
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Relocate to BongamGongdan Free Trade Zone 1st Sector |
| ㆍ2007 January |
Registered Foreign Investment Company |
ㆍ2007 November
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Business Partnership with Farymann Diesel (Germany) |
ㆍ2008 May
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Repair and Overhaul of High Pressure Washer Equipment from the US Army based in South Korea |
ㆍ2008 September
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Relocate to BongamGongdan Free Trade Zone 3rd Sector, according to business expansion and company growth |
ㆍ2010 March
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Certified in Defense Quality Management System |
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| ㆍ2011 February |
Production start of 2- and 3- Cylinder Diesel Engines |
ㆍ2013 April
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Change of the company name to TZEN Co., Ltd |
ㆍ2017 October
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Localization of Diesel Engines and Auxiliary Power Units |
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