[ Electric heat-treating furnaces; electric heating units for electric furnaces, electric ovens and electric heat-treating furnaces; ] [ dehydrators for continuous drying and removal of moisture from compressed air; ] [ crystal growing furnaces; fluid handling equipment for plumbing use, namely, fluid control valves; water cooling towers; ] [ industrial air cleaners; ] [ cable pressurization units comprised primarily of air dryers, compressors, central office manifolds, distribution manifolds, meters and pipe feed access panels, and air pipe connectors for use in forcing dry air into cables in order to protect the cables from water damage; ] [ electric dehydrators for continuous drying and removal of moisture from compressed air; air dryer monitoring and control systems comprised primarily of moisture separators, valves, strainers, heat exchangers and moisture indicators; ] [ cooling towers; ventilating fans for industrial use; portable electric heaters; electric wall heaters for commercial and industrial use; ] [ refrigerated air dryers; switching valves for desiccant air dryers; ] [ electric room heaters; fans and ventilators for room ventilation; ] [ desuperheaters ] [ ; airport lighting systems comprised primarily of lighting units, power converters, internal controllers and series controllers ]