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API Spec 6A Addendum 1
New product
API Spec 6A Addendum 1 Addendum 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