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Harmonized System
Section XV > Chapter 73 > Heading 7307 > 7307.2 > 7307.23
Butt welding fittings
Section XV > Chapter 73 > Heading 7307 > 7307.9 > 7307.92
Threaded elbows, bends and sleeves
Section XV > Chapter 73 > Heading 7307 > 7307.9 > 7307.93
Butt welding fittings
Section XV > Chapter 73 > Heading 7308
Structures (excluding prefabricated buildings of heading 94.06) and parts of structures (for example, bridges and bridge-sections, lock-gates, towers, lattice masts, roofs, roofing frame-works, doors and windows and their frames and thresholds for doors, shutters, balustrades, pillars and columns), of iron or steel; plates, rods, angles, shapes, sections, tubes and the like, prepared for use in structures, of iron or steel.
Section XV > Chapter 73 > Heading 7308 > 7308.10
Bridges and bridge-sections
Section XV > Chapter 73 > Heading 7308 > 7308.20
Towers and lattice masts
Section XV > Chapter 73 > Heading 7308 > 7308.30
Doors, windows and their frames and thresholds for doors