GB/T 13871.4-2023 Chinese PDF (GB/T13871.4-2023) GB/T 1480-2025 English versions: GB/T 45278

English versions: GB/T 45278

English versions: GB/T 22474-2025

5-2025_Chinese: Uncut finished spectacle lenses - Part 5: Abrasion-resistant of surfaces test methods (Chinese: 眼镜镜片 第5部分：表面耐磨试验方法)

13-2025_Chinese: Electronic railway equipment - Train communication network (TCN) - Part 4-1: The test method of train communication network based on Wire Train Bus(WTB) (Chinese: 轨道交通电子设备 列车通信网络（TCN) 第4-1部分：基于绞线式列车总线（WTB）的列车通信网络试验方法)

GB/T 45457

GB/T 13871.4-2023 Chinese PDF (GB/T13871.4-2023) GB/T 1480-2025 English versions: GB/T 45278GB T 13871. 4 2023_Chinese: Rotary shaft lip type seals incorporating elastomeric sealing elements Part 4: Performance test procedures (Chinese: 4) Note Careful: Text of PDF is in Chinese (not English). Delivery (PDF in Chinese): 2 working hours typically, ASAP English versions: GB T 13871. 4 2023