installation, maintenance and repair of apparatus for supplying gas; installation of gas supply and distribution apparatus; installation, maintenance and repair of gas and electricity systems; maintenance and repair of gas and electricity installations; installation of plumbing; maintenance of plumbing; plumbing services; installation of equipment and apparatus for gas and water supply; repair of gas and water installations; installation of plumbing systems; advisory services relating to the installation of plumbing; plumbing maintenance advisory services; advisory services relating to the maintenance of plumbing; plumbing installation advisory services; plumbing repair advisory services; advisory services relating to the repair of plumbing; maintenance of apparatus for purifying water; installation, maintenance and repair of water supply apparatus; maintenance of water purifying apparatus; routine servicing of heating apparatus; installation, maintenance and repair of gas, electricity and water supply apparatus; installation of water supply apparatus; installation of water pipes; repair of apparatus for purifying water; repair or maintenance of water purifying apparatus; emergency servicing of water supply apparatus; repair of water purifying apparatus; installation of apparatus for lighting, heating, steam generating, cooking, refrigerating, drying, ventilating, water supply and sanitary purposes; repair of apparatus for lighting, heating, steam generating, cooking, refrigerating, drying, ventilating, water supply and sanitary purposes; installation and repair of heaters for baths; installation of apparatus for sanitation; installation of pipes; installation of heating, lighting and cooking apparatus; repair of energy supply installations and of apparatus for lighting, heating, steam generating, cooking, refrigerating, drying, ventilating, water supply and sanitary purposes; installation and repair of water closets; installation of apparatus for heating; water closet installation and repair; routine servicing of drying apparatus; repair or maintenance of water purifying apparatus and providing information relating thereto; installation, maintenance and repair of household apparatus and appliances; repair or maintenance of water purifying apparatus and provision of information relating thereto; grouting services; repair of gas supply systems; gas supply system repair services; repair and maintenance of gas and electricity installations; repair of plumbing; repair of water supply apparatus; repair of water supply installations; maintenance and repair services of public utilities in buildings; repair or maintenance of gas water heaters; routine servicing of air-conditioning apparatus; installation and repair of heating; installation, maintenance and repair of heating apparatus; heating installation and repair; repair and maintenance of heating apparatus; maintenance and repair of heating installations; maintenance and repair of heating apparatus; repair of air-conditioning apparatus; air-conditioning system installation and repair; repair or maintenance of air-conditioning apparatus; repair and maintenance of air conditioning apparatus; repair and maintenance of air-conditioning apparatus; installation and repair of air-conditioning systems; maintenance and repair of air conditioning apparatus; maintenance and repair of air-conditioning apparatus; installation and repair of air-conditioning apparatus; repair or maintenance of air-conditioning apparatus for industrial purposes; repair and maintenance of air conditioners; installation, maintenance and repair of air-conditioning systems; air conditioning installation renovation; maintenance and repair of air conditioners; installation, maintenance and repair of air-conditioning apparatus; air conditioning installation refurbishment; repair of heating systems; repair of heating equipment; renovation of air conditioning installations; air conditioning machine renovation; repair of air filters; repair of heating, air-conditioning and alarm installations; heating equipment repair; refurbishment of air conditioning installations; air-conditioning installation refurbishment; air conditioning machine refurbishment; providing information relating to the repair or maintenance of air-conditioning apparatus; installation and repair of heating, ventilating and air-conditioning systems; air-cooled heat exchanger installation, maintenance and repair; renovation of air conditioning machines; air conditioning installation rehabilitation; air conditioning apparatus refurbishment; renovation of air conditioning apparatus; refurbishment of air-conditioning installations; refurbishment of air conditioning machines; rehabilitation of air conditioning machines; refurbishment of air conditioning apparatus; repair of air filters and parts thereof; repair of heaters; rehabilitation of air conditioning installations; heating system maintenance and repair; repair of air filtering apparatus; refurbishment of air-conditioning apparatus; air-conditioning apparatus refurbishment; repair of heating apparatus; installation, maintenance and repair of air-cooled heat exchangers; rehabilitation of air conditioning apparatus; heating equipment maintenance and repair; maintenance and repair of heating systems; provision of information relating to the repair or maintenance of air-conditioning apparatus; heater maintenance and repair; repair and maintenance of cooling appliances and installations; maintenance and repair of heaters; repair; heating system installation and repair; air conditioning apparatus rehabilitation; installation, maintenance and repair services of air-cooled heat exchangers; maintenance and repair of heating equipment; heating equipment installation and repair; heater installation and repair; installation and repair of heating systems; maintenance and repair of cooling appliances and installations; cleaning of air-conditioning apparatus; air conditioner cleaning services; air-conditioning apparatus cleaning services; gas supply system repair; repair and maintenance of heating, refrigerating, air-conditioning, drying, ventilating and dust extraction apparatus; cleaning of air conditioners; maintenance and repair; installation, maintenance and repair of heating systems; heating system installation, repair and maintenance; heating equipment installation, repair and maintenance; installation, maintenance and repair of heating, ventilation and air-conditioning [HVAC] systems; heater installation, repair and maintenance; installation, repair and maintenance of heating systems; installation, repair and maintenance of heaters; heating system installation, repair and maintenance services; air conditioning apparatus installation; heater installation, repair and maintenance services; heating equipment installation, repair and maintenance services; installation, repair and maintenance of heating equipment; installation, maintenance and repair of HVAC [heating, ventilation and air conditioning] systems; repair of electric hotplates; installation, maintenance and repair of air freshening apparatus; building repair; repair services; repair and maintenance services; electric appliance repair; maintenance and repair services; repair or maintenance of electric motors; installation of control systems for air conditioning; building maintenance and repair; building repair and maintenance; installation, maintenance and repair of air pumps; repair and maintenance of office buildings; electric apparatus repair; roofing repair; roofing installation; installation of roofing; maintenance of roofing; roofing services; roofing maintenance; repair of roofing; roofing construction services; roof installation; roof maintenance; restoration of roofing; roofing maintenance services; roofing contractor services; roof repair; roofing restoration; services of a roofing contractor; repair of roofs; roofing repair services; roof tiling services; roof restoration; roof installation services; roof maintenance services; restoration of roofs; roofing restoration services; providing information relating to roofing installation and repair; provision of information relating to roofing installation and repair; installation of insulating materials in buildings, roofs and structures; insulation of internal and external walls, ceilings and roofs; roof repair services; roof restoration services; repair and maintenance of electrical apparatus; maintenance and repair of electrical apparatus; repair of electrical equipment and electrotechnical installations; renovation, repair and maintenance of electrical wiring; installation and repair of electrical appliances; installation of electrical wiring; electrical wiring services; electrical installation services; installation of electrical apparatus; providing information relating to the installation of electrical apparatus; installation of electrical wiring for buildings; installation of electrical appliances; installation of electrical apparatus or generators; installation, maintenance and repair of electrical devices; installation, maintenance and repair of electrical equipment; installation of electrical apparatus for buildings; repair of electrical equipment; installation of electrical machinery and generators; installation, maintenance and repair of electrical and electronic apparatus and equipment; installation, maintenance and repair of apparatus for supplying electricity; electrical equipment repair; electric appliance installation; telecommunication wiring; installation, maintenance and repair of electronic, electrical and mechanical apparatus; repair of electrical apparatus; installation, maintenance and repair of electrical lighting apparatus; repair of electrical appliances; installation of electric light and power systems; repair and maintenance of electrical appliances; electric apparatus installation; services of electricians; construction work relating to the installation and maintenance of electrical systems; installation, maintenance and repair of apparatus for generating electricity; maintenance and repair of electrical appliances; maintenance of consumer electrical appliances; wiring services for telecommunications; electric appliance installation and repair; telecommunication wiring services; repair or maintenance of electric cooking apparatus and installations; advisory services relating to the installation, maintenance and repair of mechanical and electrical equipment; plumbing; toilet [water-closet] installation and repair; installation and repair of toilets [water-closets]; shower installation and repair; installation and repair of bathroom heating devices; restoration of bathroom fittings; installation of kitchen equipment; repair of kitchen equipment; maintenance, servicing and repair of household and kitchen appliances; installation of laundry and kitchen equipment; installation of cooking appliances; installation, maintenance and repair of kitchen equipment; kitchen equipment installation