21 FANS, FLATIRONS; ELECTRIC HEATING APPARATUS, PARTS AND SUPPLIES THEREFOR; TRANSFORMERS; ELECTRIC ALARM SYSTEMS, PARTS AND SUPPLIES THEREFOR; SWITCHBOARDS, PARTS AND SUPPLIES THEREFOR; ELECTRIC THERMIONIC AMPLIFIERS; LIGHTING INSTALLATIONS AND FITTINGS; TRANSISTORS; AND ELECTRICAL EQUIPMENT INCLUDING TRANSISTORS AND PARTS AND SUPPLIES THEREFOR