Explanatory notes
… the character of articles or of products falling in other headings. The heavier angles, shapes and sections (e.g., … and joists) are used in the construction of bridges, buildings, ships, etc.; lighter products are used in the … ( heading 73.08 ). ° ° ° Subheading Explanatory Notes. Subheadings 7216.10, 7216.21, 7216.22, 7216.31, 7216.32, …