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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.