Certificate of “Black Ring "acetylene carbon black Gold Medal issued by National Quality Evaluation Committee in 1985 |
Certificate of “Black Ring "acetylene carbon black Gold Medal issued by National Quality Evaluation Committee in 1991 |
"National Quality Award"issued by National Economic Committee |
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Gold Medal of “XING YU CUP” issued by Government of Henan Province |
Certificate of Quality System Authentication issued by China Classification Society |
Certificate of Quality System Authentication issued by China Classification Society |