9 Low-voltage power supplies; rotary converters; electric current control devices; power controllers; direct current converters; voltage regulators; voltage stabilizing power supply; frequency stabilizers; welding masks.
11 Heating elements; infrared heating panels; heating filaments, electric; hot air heating apparatus; heat guns; hot air ovens; electrical induction heating apparatus for heating metal workpieces; electric pocket warmers for warming hands; friction lighters for igniting Bunsen burners.