On October 17, 2019, the National Market监督管理总局 approved the "Standard Materials for Spectral and Composition Analysis of Zinc Alloys, Copper and Copper Alloys, Lead Concentrates, Zinc Concentrates, Copper Concentrates, Molybdenum Ores, and Molybdenum Concentrates" developed by Jinan Zhongbiao Technology Co., Ltd./Shandong Zhongbiao Qiyixin Inspection and Testing Technology Co., Ltd. The certification numbers for the standard materials are "Certificate No. 1998" and "Certificate No. 2004".
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