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API Spec 20A:2012

Заменен
Carbon Steel, Alloy Steel, Stainless Steel, and Nickel Base Alloy Castings for Use in the Petroleum and Natural Gas Industry, First Edition, Includes Addendum 1 (2013), Addendum 2 (2015), Errata 1, August 2015 — 40 стр.
API Spec 20A:2012
Заменен
API Spec 20A:2017
Действует