6
Drain pipes of metal; Drain traps [valves] of metal; Drain pipes of metal for use in the construction of basement waterproofing systems; Gulleys of metal; Expansion joints of metal for pipelines and ducts; Metal moulds for forming cement products; Cast iron pipes; Cast iron for use in building; Zinc-coated steel sheets; Zinc alloy ingots; Metal barriers; Crash barriers of metal; Barricades for highways (Metal -); Metal barriers for pedestrian traffic control; Fireplace grates of metal; Wire nets and gauzes; Rainwater reservoirs of metal; Rainwater hoppers of metal; Pig iron; Zinc ingots; Manhole covers, Of materials of metal; Gratings of metal
19
Drain pipes, not of metal; Plastic conduits for drainage; Rigid underdrainage pipes, not of metal; Secondary moisture drainage facilities composed of gutters and collectors, not of metal; Drain traps [valves], not of metal or plastic; Plastic water conduits for roofs; Pipes made of cement; Pipes made of cement; Wood-fiber reinforced cement boards [cement excelsior boards]; Building and construction materials and elements made of pitch, tar, bitumen or asphalt; Building and construction materials and elements made of sand, stone, rock, clay, minerals and concrete; Building and construction materials and elements made of wood and artificial wood; Grilles, not of metal; Crash barriers, not of metal, for roads; Barricades for highways (Non-metallic -); Non-metal barriers for pedestrian traffic control; plastic water conduits for roofs and balconies; Manhole covers, not of metal; Gutters of concrete; Gutters of concrete or Channels of reinforced concrete; Tubes and channels of concrete for underground soil drainage; Street gutters, not of metal; Drainage installations (Non-metallic -)
42
Building design services; Building research services; Conducting technical project studies for construction projects; Design planning; Design of pipelines; Engineering drawing