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STANDARDPRACTICESTEELPIPELINEFLANGESDevelopedandApprovedbytheManufacturersStandardizationSocietyoftheOriginallyApprovedJuly1952ValveandFittingsIndustry,Inc.5203LeesburgPike,Suite502FallsChurch,Virginia22041SP-441981Edition
