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10/08/2013 - API 6A 20th Edition Errata 4

Wellhead and Christmas Tree Equipment Errata 4 to API Spec 6A, Specification for Wellhead and Christmas Tree Equipment, 20th Edition, has been published dated August 5, 2013 - The Date of Issue of this errata is August 2013 - The Effective Date of this errata is August 2013 The change from the previous Errata is Removal of ASTM A453 Grade 660 material from Annex G table G.4 for more details find update and any other errata and addendum on API website

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