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Electrical power supplies; uninterruptible electrical power supplies; parts and accessories for electrical power supplies; buffer (hold-up) modules for power supplies; buffer modules; voltage drop protection apparatus; voltage monitor modules; voltage monitoring units; voltage stabilizers power supplies; switching power supplies; parts and accessories for switching electrical power supplies; non-contact power supplies; parts and accessories for non-contact electrical power supplies; bidirectional power converters; parts and accessories for bidirectional converters; DC/DC power converters; parts and accessories for DC/DC power converters; DC/AC inverters; parts and accessories for DC/AC power inverters; power distribution or control machines and apparatus; rotary converters; phase modifiers; noise filter being an electronic component for electrical communication machines and instruments; noise filter being an electronic component for electronic machines and apparatus; parts and fittings for noise filter for electrical and electronic communication machines and instruments; digital communication apparatus for electrical power supply; power supply control machines and apparatus; digital control system for power supply; telecommunication machines and apparatus; personal digital assistants; smartphones; recorded and downloadable computer software used to monitor, manage and control power supplies; recorded and downloadable computer software used to monitor, manage and control bidirectional power converters; recorded and downloadable computer software used to monitor, manage and control DC/DC converters; recorded and downloadable computer software used to monitor, manage and control DC/AC power inverters; laboratory apparatus and instruments; optical machines and apparatus; measuring or testing machines and instruments; solar batteries; electric storage batteries for electrical power supply; electrical cells and batteries; electric or magnetic meters and testers; electric wires and cables; electronic publications