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Company History
1999 ●
Shanghai Siyuan Trading Co., Ltd. established, acting as the agent of oversea enameled wire equipment
2003 ●
Shanghai Dean Electrical Co.Ltd. established, focusing on R&D of enameled wire testing instruments
2004 ● Shanghai SINO Insulation Material Co., Ltd. established
Shanghai Dean Electrical Co.Ltd. launched the first enameled wire dielectric loss tester in China
2009 ●
Shanghai SINO Insulation Material Co., Ltd.put in production with an annual production of 200
tons of composite paper.

2011 ●
The enameled wire dielectric loss tester by Shanghai Dean Electrical Co., Ltd. obtained the national
invention patents

2012 ●
Shanghai Dean Electrical Co., Ltd. was awarded Shanghai New Hi-tech Enterprise.
2013 ●
Shanghai BYT Testing Service Co., Ltd. established
2014 ●
Shanghai SINO Insulation Material Co., Ltd. was awarded Shanghai New Hi-tech Enterprise
2015 ●
Shanghai BYT Testing Service Co., Ltd. obtained the qualification of CMA
2016 ●
Shanghai BYT Testing Service Co., Ltd.obtained the qualification of CNAS.
2017 ●
Dean Group relocated in Lingang, Pudong New Area because of the business development.
2018 ●
Shanghai SINO Insulation Material Co., Ltd.completed the shareholding reform.