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Apparatus for heating, steam generating, cooking, refrigerating, drying, ventilating, water supply and sanitary purposes, namely, steam generators; air-purifiers; air purifying apparatus and machines; air filtering installations; air sterilizers; electric air deodorizers; air humidifiers, dehumidifiers; dust air filters for electric air deodorizers; ionization apparatus for the treatment of air; air diffusers, aroma diffusers; lamps; light diffusers; steam facial apparatus, namely, saunas; sterilizers