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An illustration drawing without any word(s), letter(s), or number(s)
AIR TO AIR HEAT EXCHANGERS NOT BEING PART OF MACHINES; LIQUID HEAT EXCHANGER NOT BEING PART OF MACHINES; SMART HEAT EXCHANGER NOT BEING PART OF MACHINES; AIR-CONDITIONING APPARATUS; AIR COOLING APPARATUS; AIR-CONDITIONING, AIR COOLING AND VENTILATION APPARATUS AND INSTRUMENTS; ELECTRIC VENTILATION FAN FOR HOUSEHOLD, COMMERCIAL AND INDUSTRIAL USE; VENTILATION DRYER IN THE NATURE OF A DRYING APPARATUS FOR USE IN HEATING, VENTILATION SYSTEMS, AIR-CONDITIONING SYSTEMS AND REFRIGERATION SYSTEMS; AIR CIRCULATION EQUIPMENT, NAMELY, ELECTRIC FANS, AIR CONDITIONERS AND AIR HANDLERS; ELECTRIC AIR-CIRCULATION FAN, RANGE HOODS, HEAT PUMPS