Dynamos; Anti-pollution devices for motors and engines; Back pressure valves as parts of machines; Blowing machines for the compression, exhaustion and transport of gases; Compressed air machines; Cylinder heads for engines; Generators of electricity; Ignition magnetos for engines; Piston rings being engine parts; Pneumatic controls for machines, motors and engines; Power transmission belts for machines, motors and engines used in industrial applications; Pressure regulators being parts of ma...