CNIS GB/T 9116.3-88 Hubbed slip-on-welding steel pipe flanges with flat face for PN 2.0MPa (20 bar). Формат поставки-PDF. Язык стандарта-Английский
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CNIS GB/T 9116.3-88 Hubbed slip-on-welding steel pipe flanges with flat face for PN 2.0MPa (20 bar)