6
Metal hardware; Tanks of metal; Metallic containers; Ties of metal for binding; Ducting conduit installations (Non-electric -) of metal; Ducting conduit installations (Non-electric -) of metal; Vats of metal; Drains made of metal; Rainwater reservoirs of metal; Windows of metal; Fittings of metal for windows; Dome shaped skylight windows (Metal -); Roofing tiles of metal; Building and construction materials and elements of metal; Common metals and their alloys; Transportable buildings of metal; Non-electric cables and wires of common metal; Small items of metal hardware; Containers of metal [storage, transport]
7
Filtering machines, separators and centrifuges; Steam traps; Machines for use in the processing of water; Water pumps
9
Fire-extinguishing systems; Noise filters; Data collection apparatus; Oil-water thermistors; Battery charging devices for motor vehicles; Scientific apparatus and instruments
11
Filters for wastewater; Industrial waste water purification plants; Sewage purification apparatus; Wastewater purification units; Water purifying apparatus and machines; Filters for water purifiers; Water purifying installations; Tub wastes; Rainwater purification installations; Grease filters [parts of extractor fans]; Separators for scrubbing air; Safety fittings for water pipes; Regulating apparatus for water apparatus; Filter elements for the air vents of water supply tanks; Water purifying apparatus; Filters for water purifiers; Water filtering apparatus; Septic tanks; Sewage purification installations; Wastewater purification units
19
Ponds [non-metallic structures]; Guttering (Non-metallic -) for the collection of waste water; Guttering (Non-metallic -) for the dispersal of waste water; Rain traps, not of metal; Rainwater reservoirs (Non-metallic -); Guttering (Non-metallic -) for the collection of rainwater; Non-metal windows; Dome shaped skylight windows (Non-metallic -); Noise barriers made of wood; Concrete; Water-pipes, not of metal; Building materials (non-metallic); Non-metallic rigid pipes for building; Non-metallic transportable buildings
37
Repair or maintenance of water purifying apparatus; Providing information relating to the repair or maintenance of water purifying apparatus; Installation of rainwater tanks; Cleaning of water supply plumbing; Installation of rainwater drainage systems; Installation of rainwater collection systems; Installation of rainwater harvesting systems; Installation of environmental protection systems; Advisory services relating to the maintenance of environmental control systems
42
Technical design and planning of water purification plants; Research in the field of environmental conservation; Consultancy services relating to research in the field of environmental protection; Science and technology services; Research relating to technology; Scientific services and design relating thereto; Technological services and design relating thereto; Scientific research