CNIS GB/T 9116.17-88 Hubbed slip-on-welding steel pipe flanges with tongue and groove face for PN2.5MPa (25 bar). Формат поставки-PDF. Язык стандарта-Английский
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CNIS GB/T 9113.25-88 Integral steel pipe flanges with ring-joint face for PN 25.0MPa (250 bar)