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MAGNETIC COMPONENTS INCLUDING TRANSFORMERS, REACTORS, CHOKES, FILTERS AND COILS;[ LOAD BANKS,] POWER SUPPLIES; GENERATOR SET CONTROL DEVICES INCLUDING GENERATOR VOLTAGE REGULATORS, GENERATOR EXCITER REGULATORS, SERIES BOOST OPTION ASSEMBLIES, MANUAL VOLTAGE CONTROL ASSEMBLIES AND UNDERFREQUENCY OVERVOLTAGE ASSEMBLIES; ELECTRIC RELAYS INCLUDING REVERSE POWER RELAYS, SYNCHRONOUS MOTOR PULLOUT RELAYS AND OVERCURRENT PROTECTIVE RELAYS; AUTOMATIC SYNCHRONIZERS; ELECTRIC MOTOR SPEED CONTROLS FOR CONSTANT AND VARIABLE SPEED MOTORS; [BATTERY CHARGERS; ] ELECTRIC GENERATOR CONTROL SYSTEMS, STATIC POWER SYSTEMS AND UNINTERRUPTED POWER SYSTEMS; AND ELECTRICAL ASSEMBLIES AND SUBASSEMBLIES INCLUDING CIRCUIT BOARD ASSEMBLIES, TRANSFORMER RECTIFIER ASSEMBLIES, CONTROL ASSEMBLIES, SENSING ASSEMBLIES, POWER AMPLIFIER ASSEMBLIES, HEAT SINK ASSEMBLIES AND STATIC VARIABLE VOLTAGE DEVICES