NBN G 42-012-1979 6250 《纺织工业器械 内压辊，用于牵的纺筒》.pdf

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STAS 8614-1985 POLYPROPYLENE TUBES FOR TEXTILE INDUSTRY General technical requirements for quality《用于纺织工业的聚丙烯管 一般质量技术要求 》.pdf

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