ELECTRICAL EQUIPMENT FOR INDUSTRIAL USE-NAMELY, [ INSULATION FOR PIPE LINE JOINTS, CIRCUIT BREAKERS, SWITCHES, SWITCHGEAR, SWITCHBOARDS AND PANELS AND ENCLOSURES THEREFOR, CURRENT LIMITERS, LIGHTING PANELS AND FIXTURES, STARTERS, CONTACTORS, RELAYS, TELEPHONES AND SIGNALS, RECTIFIERS, HOWLERS AND HORNS, MANUALLY SET TIMERS, TRANSFORMERS, ELECTRONIC SYNCHRONIZERS, VOLTAGE REGULARTORS, BATTERY CHARGERS, GROUND DETECTORS, GENERATORS, SUBSTATIONS, ] HEATER UNITS [ POWER FACTOR CAPACITORS; AND ELE...