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QC/T 669-2019 English PDF (QCT669-2019)

QC/T 669-2019 English PDF (QCT669-2019)

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QC/T 669-2019: Automotive Air-Condition Pipe-Fittings and Pipes
This Standard specifies the structural type, size and technical requirements of pipe fittings and pipe ends for automobile air-conditioning system. This Standard is applicable to pipe-fittings and pipes for HFC-134a/HFO-1234yf systems of automobile air conditioner.

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