roofing of metal, incorporating solar cells; fittings of metal for building; building materials of metal, namely, building panels of metal, building boards of metal, metal building flashing; nails of metal; screws of metal; furniture fittings of metal; door fittings of metal; fittings of metal for windows; water-pipes of metal; junctions of metal for pipes

solar lamps; water heaters; ventilation installations and apparatus; solar furnaces; solar heat accumulators; solar thermal heating plates; solar thermal collectors for heating

building construction; roofing services; machinery installation, maintenance and repair; electric appliance installation and repair