A

TRANSFORMERS, BALLASTS, REACTORS, BATTERY CHARGERS AND BOOSTERS, ELECTRICAL POWER SUPPLIES, D.C. POWER SUPPLIES, VOLTAGE STABILIZERS, ADJUSTABLE FREQUENCY REGULATORS, VOLTAGE REGULATORS, AND PARTS, ELECTRONIC TEST UNITS, VOLTAGE CONTROL REGULATORS, VOLTAGE SURGE SUPPRESSORS, STANDBY POWER SUPPLIES, UNINTERRUPTIBLE POWER SUPPLIES, POWER LINE CONDITIONERS, RECTIFIERS, ELECTRICAL CONVERTERS AND PARTS THEREOF; BUT NOT SIGNAL DISTRIBUTION EQUIPMENT SUCH AS MULTICOUPLERS, SWITCH MATRICES AND MICROWAVE RECEIVERS