GB/T 13871.4-2023 Chinese PDF (GB/T13871.4-2023)GB 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
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