1、Corrosion-resistant Bolting for Use in the Petroleum and Natural Gas IndustriesAPI SPECIFICATION 20FSECOND EDITION,MAY 2018API MONOGRAM PROGRAM EFFECTIVE DATE:NOVEMBER 1,2018ERRATA 1,OCTOBER 2020ADDENDUM 1,NOVEMBER 2021(API MONOGRAM PROGRAM EFFECTIVE DATE:MAY 1,2022)Special NotesAPI publications nec
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