DIN EN ISO 28721-4 Vitreous and porcelain enamels - Glass-lined apparatus for process plants - Part 4: Quality requirements for glass-lined flanged steel pipes and flanged steel fittings (ISO 28721-4:2010); Немецкий version EN ISO 28721-4:2012. Формат поставки-PDF. Язык стандарта-Немецкий
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