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GOST 12820 Flange
GOST/ГОСТ 12820-80 FLANGE PN2.5MPa PLATE RF
GOST/ГОСТ 12820-80 FLANGE PN1.6MPa PLATE RF
GOST/ГОСТ 12820-80 FLANGE PN1.0MPa PLATE RF
GOST/ГОСТ 12820-80 FLANGE PN0.6MPa PLATE RF