Staircases of metal; buildings, transportable, of metal; greenhouses of metal, transportable; transportable buildings of metal; pillars of metal for building; building materials of metal, namely, metal canopies, awnings of metal, drywall corner bead of metal, stair nosing of metal and portable metal levees; framework of metal for building; roof gutters of metal; [ windows of metal; ] wall tiles of metal * ; all the above not including windows doors, gates, roller shutters, roller blinds and r...