660 - Chemical engineering 43
664 - Food technology 39
663 - Beverage technology 18
662 - Explosives, fuels & related products 15
665 - Industrial oils, fats, waxes & gases 12
669 - Metallurgy 7
666 - Ceramic & allied technologies 6
668 - Technology of other organic products 6
661 - Industrial chemicals 1
667 - Cleaning, color & coating technologies 1