In August 2021, the National Market监督管理总局 approved the "Spectral Analysis Standard Materials for Carbon Steel, Alloy Steel, Stainless Steel, and Brass" developed by Jinan Zhongbiao Technology Co., Ltd. / Shandong Zhongbiao Qiyi Detection Technology Co., Ltd. The standard material certification numbers are "Certificate No. 3524, 3525, 3526, and 3527."
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