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GB/T 45439-2025_Chinese: Technical specification for the application of traceability two-dimensional code on fuel gas cylinders and fuel gas cylinder valves (Chinese: 燃气气瓶和燃气瓶阀溯源二维码应用技术规范) Note/Careful: Text of PDF is in Chinese (not English). Delivery (PDF in Chinese): 2 working-hours typically, ASAP English versions: GB/T 45439-2025
