7 Electric motors for machines; aircraft motors; electric motors for use in aeronautic vehicles; couplings and transmissions for machines; couplings and transmissions for aircraft; air filters for engines; carburetors for vehicles; spark plugs for internal combustion engines; ignition coils and distributors for internal combustion engines; ignition magnetos for internal combustion engines; transmission shafts other than for land vehicles; aircraft engines; pneumatic controls for internal combustion engines; stuffing boxes; lubricating boxes; fuel converters for internal combustion engines; torque converters; engine belts; cylinder heads; motor cylinder; motor starters; fuel economizers for motors; clutches; blowers for gas compression and intake; electric generators; lubricating pumps for machines; emergency electric generators; hydraulic controls for machines and motors; hydraulic motors; hydraulic turbines; universal joint seals and mechanical seals for machines; fuel injectors for motors; pistons; speed regulators for engines; bearings for transmission shafts; fuel pumps; oil pumps; centrifugal pumps for engines; cooling radiators for engines; jet engines; super heaters for engines; engine boosters; turbo-compressors; motor fans; gear boxes other than for land vehicles; machine parts, namely, ball-bearing bushes, greasing bushes, piston bushes, engine connecting rods, ball-bearings, roller bearings, machine or motor control cables, control chains, drive chains, thermal exchangers, exchange pipes, ejectors, gears, grease nipples, bearing seats, pressure relief valves, pressure regulators, pressure valves, regulators, springs, engine valves, engine gears rollers bearings, piston rings, and thermal exchangers