Wastewater purification units; purification installations for sewage; cavitation reactors for chemical processing; pasteurizers for chemical, gas production, food and waste industries; pasteurizers for food and beverages; artificial mist generating machines for outdoor cooling; heat generators; glue-heating appliances in the nature of electric glue pots; disinfectant apparatus; heat exchangers, other than parts of machines; ionization apparatus for the treatment of water; water purifying appa...