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Based on limited metadata, this warning letter was issued to Guangzhou Tinci Materials Technology Co., Ltd., a materials technology company, on January 23, 2020. Without access to the full letter text or specific subject line details, the exact nature of the violations cannot be determined from the available information. The letter was classified under "Other" product category, though the issuing FDA office is not specified in the metadata provided. Additional documentation would be needed to identify the specific regulatory violations and compliance issues cited.