11 Industrial installations for heating, steam generating, refrigerating, drying, ventilating, water supply and sanitary purposes, namely, heaters; boilers; refrigerators; dryers; homogonizers, distillers; liquid cooled heat exchangers; fluid-bed dryers; steam condensers; steam ejectors; steam generators; evaporators; rectifiers; liquid filters; heat pumps, reverse-cycle heating devices comprising pumps, heat-exchangers, pipelineS, valves and nozzles; heat-accumulators; air-filters for industrial use; gas-filters for industrial use; Diesel engine, compressor, generator and transformer cooling systems composed of compressors, radiators, pumps, hoses, pipes, throttles and cooling liquids and gases; closed circuit cooling systems composed of pumps, heat exchangers, radiators and pipelines; cooling-towers; air cooled heat exchangers; air conditioners; garbage incinerators; industrial ovens; devices for the treatment of waste water, namely, sewage unifiers comprising catch pits, purification cones, filter beds and water filters; gas burning heaters; furnaces; microwave spray dryers for use in powder technology; thermo-oil heated heat exchangers; waste heat boilers; gas pre-heaters; plate-type heat exchangers; drying devices, namely, spray dryers and fluid-bed dryers; freezers; spray freezers; liquid chillers; automatic defrosters; components for automatic defrosters, namely, defroster nozzles; refrigerator condensers; modular cooling towers; vacuum coolers; single and double walled tubular heat exchangers; natural draft cooling towers; cooling tower cells; contact coolers; evaporative devices, namely, evaporators, jet evaporators, spray evaporators and high-pressure-evaporators; valves use in association with installations for heating, steam generating, cooking refrigerating drying, ventilating, water supply and sanitary purposes, namely, control valves, regulating valves, by-pass valves, double-seat valves, diaphragm valves, disc valves, plaque-diaphragm valves, conical-metal nipple valves, cut-off valves, reverse valves, switching valves, electromagnetic valves, throttle valves, pressure valves, pressure control valves and return valves; ventilators; fan-assisted convectors; exhaust fans; air flow units for industrial use; water chillers; automatic defrosters; filters for filtering particles from the air; fans; air cooled heat exchangers; liquid cooled heat exchangers; air conditioners; condensers; ventilators; refrigerators; refrigerator controllers; and refrigerator regulators; Steamers and evaporators used in association with the processing and refinement of food and beverages, chemicals, and pharmaceuticals; Heat pumps; circulation pumps; heat exchangers; reverse-cycle heaters; heat accumulators; air filters for industrial use; gas filters for industrial use; Diesel engine, compressor, generator and transformer cooling systems composed of compressors, radiators, pumps, hoses, pipes, throttles and cooling liquids and gaTes; closed circuit cooling systems composed of pumps, heat exchangers, radiators and pipelines; cooling towers; heat monitors; heat regulators; and heating tanks, all used in association with the heat and energy industry; Garbage incinerators, industrial waste ovens, and industrial waste filters, all used in association with the utility industry