Apparatus for lighting, heating, steam generating, cooking, refrigerating, drying, ventilating, water supply and sanitary purposes; household appliances comprised in this class, such as cookers, ovens, microwave ovens, ranges, toasters, grills, coffee makers, electric pressure cookers, electric fryers, refrigerators, freezers, apparatus for air and water purification, parts and fittings included in this class for all the aforesaid products