AI

METALLIC ELEMENTS FOR BUILDINGS OR OTHER STRUCTURES COMPRISING STRUCTURAL SHAPES, EXPANDED METAL SHEETS, PLATES, PIPES, RODS, BARS, RAILS, BEAMS, COLUMNS, SPANDRELS, CANOPIES, DOORS, DOOR FRAMES, GRATES, GRILLES, GRATINGS, CHIMNEY ORNAMENTS, PORCH ORNAMENTS, MANHOLE STEPS, WINDOW AND DOOR LINTELS, MANHOLE FRAMES AND COVERS, PIPE SUPPORTS, WALKWAYS, PLATFORMS, DOOR SILLS, BRACKETS, TRENCH PLATES, LADDERS, LADDER GUARDS, PARTITIONS, DOOR GUARDS, MACHINERY GUARDS, WINDOW GUARDS, WALLS, [ PARTITIONS, ] PIPE RAILS, STAIR RAILS, COUNTER RAILS, BRIDGE RAILS, PORCH RAILS, BALCONY RAILS, STAIRS, FIRE ESCAPES, MONORAIL BEAMS AND SUPPORTS, TOWERS, BOILER FRAMES, AND CRANE RUNWAYS