37 Maintenance of water purifiers for household use; Kitchen equipment installation; Installation, maintenance and repair of kitchen equipment; Installation, maintenance and repair of kitchen furniture; Installation of safes; Installation and repair of heating, ventilating and air conditioning systems; Repair of heating and cooling apparatus; Installation, maintenance and repair of air conditioning apparatus; Repair of LCD projectors; Repair of food and drink processing machines; Installation, maintenance and repair of air purifying apparatus; Installation, maintenance and repair of LED lighting apparatus; Refrigerator repair; Repair of radio communication machines and apparatus; Installation, maintenance and repair of electrical and electronic apparatus and equipment; Installation, maintenance and repair of telecommunications apparatus and instruments; Installation, maintenance and repair of computer hardware; Air duct cleaning services; Disinfecting and washing of water purifiers; Repair of household appliances; Repair of telecommunication machines and apparatus; Repair of electronic appliance equipment