CNIS GB/T 9113.1-88 Integral steel pipe flanges with flat face for PN1.6 MPa(16 bar). Формат поставки-PDF. Язык стандарта-Английский
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CNIS GB/T 9116.10-88 Hubbed slip-on-welding steel pipe flanges with raised face for PN 10.0MPa (100 ...