CSA W47.1-09 Certification of companies for fusion welding of steel - Seventh Edition; Update No. 1: August 2010; Update No. 2: March 2011; Update No. 3: May 2011; Update No. 4: January 2012; Update No. 5: June 2012. Формат поставки-PDF. Язык стандарта-Английский
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