ELECTRIC OVENS; ELECTRIC HOT AIR OVENS; INDUCTION OVENS; MICROWAVE OVENS FOR INDUSTRIAL USE; ELECTRICAL HEAT STOVES; ELECTRICAL HEAT ACCUMULATORS; COMBINED ELECTRICAL AIR COMPRESSOR AND HEATERS; ELECTRICAL INDUSTRIAL BOILERS; ELECTRICAL INDUSTRIAL FURNACE APPARATUS; ELECTRIC GLUE MELTING POTS; ELECTRICAL HEAT PUMPS; ELECTRICAL HEAT TREATING FURNACES; ELECTRICAL PRESSURIZED CONTAINERS FOR INDUSTRIAL USE; ELECTRICAL PRESSURE VESSELS; ELECTRICAL AUTOCLAVES; ELECTRICAL PRESSURE CURING OVENS