Section 16 MACHINERY AND MECHANICAL APPLIANCES; ELECTRICAL EQUIPMENT; PARTS THEREOF; SOUND RECORDERS AND REPRODUCERS, TELEVISION IMAGE AND SOUND RECORDERS AND REPRODUCERS AND PARTS AND ACCESSORIES OF SUCH ARTICLES 84 NUCLEAR REACTORS, BOILERS, MACHINERY AND MECHANICAL APPLIANCES; PARTS THEREOF 84 83 AND SHAFT COUPLINGS (INCLUDING UNIVERSAL JOINTS). 84 83 50 FLYWHEELS AND PULLEYS, INCL. PULLY BLOCKS, FOR ROAD MOTOR VEHICLE ENGINES Commodity Code Description 84 83 50 10 FLYWHEELS AND PULLEYS, INCL. PULLY BLOCKS, FOR ROAD MOTOR VEHICLE ENGINES 84 83 50 20 FLYWHEELS & PULLEYS, INCL. PULLEY BLOCKS: FOR MARINE CRAFT 84 83 50 30 FLYWHEELS & PULLEYS, INCL. PULLEY BLOCKS: FOR AIRCRAFT ENGINES 84 83 50 90 OTHER FLYWHEELS & PULLEYS, INCLUDING PULLEY BLOCKS