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Metal goods for use in construction; building materials of metal; zinc; junctions of metal for pipes; metal hardware; dowel rods of metal; spars of metal for use in building; threaded bars of metal; reinforcement rods of metal; pegs of metal; structural joint connectors of metal; metal edgings; shaped metal sections; shims; set screws of metal; wood screws made of metal; eye bolts; rivets of metal; bar connectors of metal; screws of metal; gutter brackets of metal; anchor bushings of metal; metal brackets; common metals, unwrought or semi-wrought; reinforcing materials of metal for building; angle irons of metal; screw caps of metal; cable thimbles of metal; sliding rails of metal. Pneumatic tube conveyors; moving and handling equipment; pneumatically operated lifting jacks [machines]; loaders [conveyors]. Cooling appliances and installations; turbine ventilators [ventilation apparatus]; ventilation [air-conditioning] installations and apparatus; air cleaning apparatus; air cleaning filters [parts of air cleaning machines or installations]; heating units; heating apparatus and installations; heating apparatus for furnaces; industrial air purifiers. Building services relating to building for industry purposes; demolition of buildings; machinery installation, maintenance and repair; installation of apparatus for heating; building, construction and demolition; repair or maintenance of air-conditioning apparatus [for industrial purposes]. Material testing; quality control; conducting technical project studies.