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API Spec 7-1:2006 (R2021)

Заменен
Specification for Rotary Drill Stem Elements, First Edition -- Identical to ISO 10424-1:2004, Includes Addendum 1 (2007), Addendum 2 (2009), Addendum 3 (2011), Addendum 4 (2019), and Errata 1 (2020) — 87 стр.