CNIS GB/T 9119.9-88 Slip-on welding plate steel pipe flanges with raised face for PN 1.6MPa (16 bar). Формат поставки-PDF. Язык стандарта-Английский
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CNIS GB/T 9123.24-88 Steel pipe blank flanges with tongue and groove face for PN 1.6MPa (16 bar)