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Design plus words, letters, and/or numbers
Uninterruptible power supply systems, comprised of power supplies, converters, inverters, rectifiers, power transistors, transformers, and/or batteries; electric converters, AC/DC converters, DC/AC converters, electric transformers, direct current adapters and/or transformers, automatic transfer switches, electric switches, current rectifiers, electric resistances, commutators, apparatus for regulating electric voltage and current