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2-2025_Chinese: Semi-finished spectacle lens blanks - Part 2: Power-variation (Chinese: 半成品镜片毛坯 第2部分：渐变焦)
GB/T 27995
English versions: GB/T 35624-2025
GB/T 43590
GB/T 20718
GB/T 30237-2025 Chinese PDF (GB /T30237-2025) GB/T 32158-2025 2-2025_Chinese: Semi-finished spectacle lens blanksGB T 30237 2025_Chinese: Deteriorations and legends of ancient wall paintings (Chinese: ) Note Careful: Text of PDF is in Chinese (not English). Delivery (PDF in Chinese): 2 working hours typically, ASAP English versions: GB T 30237 2025
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