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GB/T 25320.4-2024 Chinese PDF (GB /T25320.4-2024) GB/T 21551.5-2024 English versions: GB/T 22249-2024

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English versions: GB/T 22249-2024

English versions: GB/T 19048-2024

English versions: GB 31648-2025

English versions: GB/T 18216

1-2025_Chinese: Semi-finished spectacle lens blanks - Part 1: Single-vision and multifocal (Chinese: 半成品镜片毛坯 第1部分：单焦和多焦)

GB/T 25320.4-2024 Chinese PDF (GB /T25320.4-2024) GB/T 21551.5-2024 English versions: GB/T 22249-2024GB T 25320. 4 2024_Chinese: Power systems management and associated information exchange Data and communications security Part 4: Profiles including MMS and derivatives (Chinese: 4MMS) Note Careful: Text of PDF is in Chinese (not English). Delivery (PDF in Chinese): 2 working hours typically, ASAP English versions: GB T 25320. 4 2024

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