Electric ignition coils; Sparking plugs; Sparking plugs for internal combustion engines; Sparking plugs for the internal combustion engines of vehicles; Carburetter feeders; Igniting devices for internal combustion engines; Carburetters; Fuel economisers for motors and engines; Glow plugs for diesel engines; Heat exchangers (parts of machines); Spark plugs; Spark plugs for engines; Spark plugs for land vehicle engines; Spark plugs for vehicle engines