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ELECTRIC RESISTORS; ELECTRIC RHEOSTATS AND POTENTIOMETERS; ELECTRIC CONTACTORS INCLUDING SWITCHES; ELECTRIC RELAYS; LIGHTING CONTROL SYSTEMS AND COMPONENTS INCLUDING SWITCHBOARDS AND DIMMERS-NAMELY, ELECTRIC CYCLE DIMMERS FOR LIGHTS, AUTOTRANSFORMERS, MOTORIZED AUTOTRANSFORMERS, INDIVIDUALLY AND IN BANKS, AND SOLID STATE CONTROLLED DEVICES; 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