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Ст.20 ГОСТ 12820-80 FLANGE ГОСТT 33259 TYPE01,TYPE 02,TYPE 05 ГОСТ 12820 ГОСТ 12821 PN06 PN10 PN10 PN16 PN25 PN40 STANDARD Type Pressure Material size Process Surface treatment GOST33259 GOST12820 ...