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API Spec 6A Addendum 4Addendum 4 to Specification for Wellhead and Christmas Tree Equipment, Twentieth Edition (ISO 10423:2009 Modification)Amendment by American Petroleum Institute, 06/01/2016
API Spec 6A Addendum 3Addendum 3 to Specification for Wellhead and Christmas Tree Equipment, Twentieth Edition (ISO 10423:2009 Modification)Amendment by American Petroleum Institute, 03/01/2013
API Spec 6A Addendum 3Addendum 3 to Specification for Wellhead and Tree Equipment, Twenty-First EditionAmendment by American Petroleum Institute, 08/01/2022
API Spec 6A Addendum 3Addendum 3 to Specification for Wellhead and Tree Equipment, Twenty-First EditionAmendment by American Petroleum Institute, 08/01/2022
API Spec 6A Addendum 2Addendum 2 to Specification for Wellhead and Christmas Tree Equipment, Twentieth Edition (ISO 10423:2009 Modification)Amendment by American Petroleum Institute, 11/01/2012
API Spec 6A Addendum 1Addendum 1 to Specification for Wellhead and Christmas Tree Equipment, Twentieth Edition (ISO 10423:2009 Modification), Includes Addenda 1(Nov 2011), 2 (Nov 2012), 3 (March 2013)Amendment by American Petroleum Institute, 11/01/2011
API Spec 6A Add 4Addendum 4 to Specification for Wellhead and Christmas Tree EquipmentAmendment by American Petroleum Institute, 12/01/2008
API Spec 6A Add 3Addendum 3 to Specification for Wellhead and Christmas Tree EquipmentAmendment by American Petroleum Institute, 12/01/2008
API Spec 6A Add 2Addendum 2 to Specification for Wellhead and Christmas Tree EquipmentAmendment by American Petroleum Institute, 12/01/2008
API Spec 6A Add 1Addendum 1 to Specification for Wellhead and Christmas Tree EquipmentAmendment by American Petroleum Institute, 02/01/2008
API Spec 6ASpecification for Wellhead and Christmas Tree Equipment, Twentieth Edition (ISO 10423:2009 Modification), Includes Errata (through Errata 10, Aug 2016), Addenda 1(Nov 2011), 2 (Nov 2012), 3 (March 2013), and 4 (June 2016)standard by American Petroleum Institute, 10/01/2010
API Spec 6ASpecification for Wellhead and Christmas Tree Equipment, Seventeenth Editionstandard by American Petroleum Institute, 11/01/1999