construction materials made of metal, namely, shores and supports; tanks of metal, namely, expansion vessels and metal fluid storage tanks; absorber tubes of metal for heat pumps; metal air ducts, namely, folded spiral-seam tube for metal ventilating ducts, metal heating ducts, and metal air conditioning ducts; substructure constructions for photovoltaic installations, namely, substrates primarily of metal for supporting solar cells, photovoltaic cells and solar collectors; assembly construct...