11
Sewage disposal plants; sewage treatment [purification]
installations; filters for wastewater; purification
installations for sewage; waste water treatment tanks;
wastewater treatment tanks for industrial purposes
19
Building and construction materials and elements, not of
metal; structures and transportable buildings, not of metal;
stand tanks of masonry; stand tanks of concrete
20
Containers, not of metal [storage, transport]; closures, not
of metal, for containers; storage tanks, not of metal or
masonry; liquid storage tanks [containers] made of
non-metallic materials; industrial water tanks, not of metal
or masonry; water tanks (non-metallic -) [containers]; water
tanks of plastic for industrial purposes; water tanks of
plastic for agricultural purposes; plastic water tanks;
reservoirs, not of metal nor of masonry
37
Building, construction and demolition; providing information
relating to the repair or maintenance of storage tanks;
providing information relating to storage tank cleaning
services; providing information relating to the repair or
maintenance of water purifying apparatus; installation of
rainwater tanks; installation of rainwater collection
systems; application of protective coatings to tank
surfaces; cleaning of storage tanks; septic tank cleaning;
repair of water supply apparatus; maintenance of water
purifying apparatus; maintenance and repair of storage
tanks; providing information relating to the repair or
maintenance of vessels; repair of biogas plants and
machines
42
Scientific and technological services; engineering services
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