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ELECTRIC RESISTORS, ELECTRIC RHEOSTATS, ELECTRIC CONTACTORS, ELECTRIC RELAYS, ELECTRIC SWITCHES, LIGHTING CONTROL SYSTEMS AND COMPONENTS INCLUDING DIMMERS, ELECTRIC CYCLE DIMMERS FOR LIGHTS, AUTOTRANSFORMERS, MOTORIZED AUTOTRANSFORMERS, INDIVIDUAL AND IN BANKS, POTENTIOMETERS, MOTOR GENERATOR CONTROLLERS, MOTOR AND GENERATOR REGULATORS USING MAGNETIC AMPLIFIERS, ELECTRIC MOTOR STARTERS AND CONTROL DEVICES ASSOCIATED THEREWITH, AND VOLTAGE AND SPEED REGULATORS FOR MOTOR GENERATOR SETS AND GENERATORS