7
Power supply apparatus [generators]; Emergency power supply generators; Water pumps; Water supply machines [pumps]
9
Telemetry apparatus; Electric power supply units; Regulated power supply apparatus; Switching power supply apparatus; Software; Electrical wiring installations
11
Chemical sterilization units [water treatment equipment]; Gravimetric dry flow feeders for water treatment; Installations for water treatment under osmotic process; Cartridge filtration units [water treatment equipment]; Water treatment apparatus; Water treatment apparatus for water purification; Water treatment apparatus for water softening; Water treatment filters; Water treatment units; Ionization apparatus for the treatment of air or water; Reverse osmosis filtration units [water treatment equipment]; Ultraviolet sterilization units [water treatment equipment]; Water treatment apparatus for water softening for domestic use
37
Electrical installation services; Installation of electrical and generating machinery; Mechanical cleaning of waterways; Advisory services relating to the installation of pumps; Advisory services relating to the installation of plumbing; Advisory services relating to the repair of plumbing; Advisory services relating to pipe laying; Advisory services relating to the installation of power plants; Advisory services relating to the repair of civil engineering structures; Advisory services relating to the maintenance of environmental control systems; Advisory services relating to the installation of generators; Cleaning of water supply plumbing; Plumbing installation, maintenance and repair; Repair or maintenance of water pollution control equipment; Repair or maintenance of water purifying apparatus
39
Power supply and distribution
40
Water treatment; Waste water treatment; Rental of water treatment equipment; Treatment of waste water; Treatment of waste water from generating operations; Treatment of waste water from industrial processes; Water treatment [demineralising] services; Water treatment services; Rental of water filters; Rental of water filtration units for commercial use; Rental of water purifying apparatus; Water treating; Water purification; Water pollution control; Water demineralization