42.14.00 Industrial Furnaces
42.14.33.13 Ceramics and Glass Melting Furnaces
42.14.13 Annealing Furnaces 42.14.16 Atmosphere Generators 42.14.19 Industrial Baking Furnaces 42.14.23 Industrial Brazing Furnaces 42.14.26 Industrial Calcining Furnaces 42.14.29 Industrial Heat-Treating Furnaces 42.14.33 Industrial Melting Furnaces 42.14.33.13 Ceramics and Glass Melting Furnaces 42.14.33.16 Ferrous Melting Furnaces 42.14.33.19 Non-Ferrous Melting Furnaces 42.14.36 Primary Refining Furnaces 42.14.43 Reactor Furnaces 42.14.46 Industrial Reheat Furnaces 42.14.53 Industrial Sintering Furnaces 42.14.56 Industrial Vacuum Furnaces