54 صفحه پی دی اف
BS ISO 12759:2010+A1:2013-Fans — Efficiency classification for fans
BS ISO 12759:2010+A1:2013-Fans — Efficiency classification for fans
54 صفحه پی دی اف
BS ISO 12759:2010+A1:2013-Fans — Efficiency classification for fans
CEI IEC 61292-3, Optical amplifiers – Part 3: Classification, characteristics and applications