METAL OR PARTIALLY METAL AIRCRAFT PARTS, NAMELY, SCREWS, NUTS, BOLTS, RIVETS, STUDS, FASTENERS, SPRINGS, AUTOMATICALLY CLOSING AND OPENING LOCKS FOR SAFETY BELT WINDING-UP ROLLERS, LOAD LOCKS, LOCKS; CENTRAL LOCKS AND FITTINGS FOR SAFETY BELTS; CONTAINERS OF METAL, METALLIC VIBRATION ISOLATORS AND DAMPERS; SPRINGS; METALLIC ABSORBING PADS; METALLIC TRAYS, RACKS, FRAMES, HOUSINGS, SUPPORTS AND MOUNTINGS FOR REDUCING VIBRATIONS, SHOCKS AND NOISE, METAL WASTE CONTAINERS, WEIGHTS AND COUNTERBALANCES