TYHI obtained the certificate of ISO9001 in 1997, and then TYHI finished standard audit and verificationtoISO9001: 2015 and obtained IEC 60300-1:2003. In 2017, TYHI obtained upgraded certificate of quality management system in the first batch. TYHI won the awards of honorable normination of “China Quality Award “ and recognition of “China Industrial Awards” etc.
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