CNIS GB/T 9121.6-88 Loose plate steel pipe flanges with weld-on collar with male and female face for PN 2.5MPa (25 bar). Формат поставки-PDF. Язык стандарта-Английский
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CNIS GB/T 9120.6-88 Loose plate steel pipe flanges with welding neck collar with tongue ans groove ...