SECTION IX - WOOD AND ARTICLES OF WOOD; WOOD CHARCOAL; CORK AND ARTICLES OF CORK; MANUFACTURES OF STRAW, OF ESPARTO OR OF OTHER PLAITING MATERIALS; BASKETWARE AND WICKERWORK > CHAPTER 44 - WOOD AND ARTICLES OF WOOD; WOOD CHARCOAL > 4418 Builders' joinery and carpentry of wood, including cellular wood panels, assembled flooring panels, shingles and shakes > Doors and their frames and thresholds