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See Chinese contents: GB/T 25988-2010 GB/T 25988-2010: Road vehicles -- Towing vehicle coupling device to tow caravans or light trailers -- Mechanical strength test
This standard specifies the test methods for the mechanical strength of coupling devices. This standard applies to the coupling device, which is installed on the towing vehicle, for towing the category O1 and O2 caravans or light trailer (excluding semi-trailer).
