July 15, 2021, spring standard revision conference (fourth) held in Suqian · Sihong, presided over by the secretary general of the National Technical Committee on Spring Standardization -- Yu Fang. This conference is hosted by the National Technical Committee of Spring Standardization and handled by
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Sunzo attend the CIPPE 2021 in Beijing, Sunzo main products are disc springs, wave spring and belleville washers,
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