Specification for Wellhead andChristmas Tree EquipmentANSI/API SPECIFICATION 6ANINETEENTH EDITION, JULY 2004EFFECTIVE DATE: FEBRUARY 1,2005CONTAINS API MONOGRAM ANNEX AS PART OF USNATIONAL ADOPTIONISO 10423:2003 (Modified), Petroleum and natural gasindustries-Drilling and production equipmentWellheadand Christmas tree equipment
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