Explanatory notes
… Cranks and crank shafts . These may be either made in one piece or assembled from several parts. They receive a … (e.g., sintered metal or plastics). They may be in one piece or in several pieces clamped together, and form a … driving belts). An assembly of two or more pulley blocks (i.e., a hoist) is, however, excluded ( heading 84.25 ). (H) …