Transformers; power supplies; power supply systems comprised mainly of transformers, * or * electrical chokes, [ or electronic power supplies in combination with manual, magnetic and solid-starters and controllers, thermal, magnetic and solid-state overload relays, push button stations, comprised of selector switches and pilot lights, control circuit switches and relays, float, flow, pressure, and vacuum-operated switches, resistors and rheostats, proximity switches, time-delay relays and switches, resistors and rheostats intended for industrial heating and lighting, namely, those for motor generator fields, controls intended for industrial heating and lighting, solid-state time-delay relays, programmable controllers, numerical control systems, lighting dimmer systems and controls, mercury-tube switches, definite purpose controllers, solid-state logic controllers and industrial microprocessor/computer systems; chokes; ] filters, namely, filters consisting of chokes in combination with electrical chokes, capacitators for use in drive technology as radio interference suppression filters or as voltage rise limiting dv/dt filters or as sinewave filters or for use in electrical power systems as harmonic filters [ ; aerators ]