Subheading 730810: Iron or Steel; Structures and Parts Thereof, Bridges and Bridge-se … etc.
Subheading 730820: Iron or Steel; Structures and Parts Thereof, Towers and Lattice Ma … etc.
Subheading 730830: Iron or Steel; Structures and Parts Thereof, Doors, Windows and th … etc.
Subheading 730840: Iron or Steel; Structures and Parts Thereof, Props and Similar Equ … etc.
Subheading 730890: Iron or Steel; Structures and Parts Thereof, N.E.C. in Heading 730 … etc.