6
Building materials and covering parts, of metal; fastenings and cover frames of metal; ironmongery, small items of metal hardware; pipes and tubes of metal; semi-finished goods and goods of common metals, in particular of zinc and zinc alloys, namely plates, sheets, boards, corner pieces, bands, bars and strips, profiled and non-profiled, including surface-treated; roofing assemblages of metal and roofing sheets; gutters of metal
37
Plumbing; building and assembly services, namely erecting roof constructions, roof coverings and facade claddings, including ventilation and drainage systems therefor, in particular using metal sheets; repair services in connection with trades of this type; planning of roof designs, roof constructions, roof coverings and facade designs, including ventilation and drainage systems therefor; development of laying techniques and special constructions in the field of structural engineering; building supervision
40
Processing of metal sheets and other semi-finished goods of metal being prefabricated articles for roof coverings, facade claddings, ventilating channels and special constructions in the field of structural engineering