… Paper and paperboard, corrugated (with or without glued flat surface sheets), creped, crinkled, embossed or perforated, …
Explanatory notes
… and paperboard, corrugated (with or without glued flat surface sheets), creped, crinkled, embossed or perforated, … of having been worked during or after manufacture in such a way that they are no longer flat or of uniform … sides (double faced). Heavier boards may be built up with successive plies of corrugated paper or paperboard with …