MACHINES FOR USE IN AGRICULTURE AND GRAIN MILLING, NAMELY FOR CLEANING, SEPARATION AND CLASSIFICATION OF GRAINS, AND GRAIN CLEANERS; ELECTRICAL MOTORS AND ENGINES FOR SUCH MACHINES; MACHINE COUPLING AND TRANSMISSION COMPONENTS FOR SUCH MACHINES, NAMELY TRANSMISSION BELTS AND MECHANICAL COUPLINGS; AGRICULTURAL IMPLEMENTS FOR SEPARATION AND CLASSIFICATION OF CEREAL GRAINS AND COMPOUNDS OF CEREAL GRAINS