RAYTHEON

APPARATUS FOR CONTROLLING OR MODIFYING ELECTRICAL CURRENTS-NAMELY, ALTERNATING CURRENT RECTIFYING SYSTEMS, ELECTRIC CURRENT AMPLIFIERS, AUTOMATIC SELF-REGULATING BATTERY CHARGERS, CHOKES, ELECTRIC RESISTANCE WELDERS, ((GENERATORS OF HIGH FREQUENCY INDUCTION HEATING CURRENT, TRANSFORMERS, VIBRATORY FEEDER CONTROLLERS, AND)) VOLTAGE REGULATORS