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Description: Metal heat transfer pipes and tilt mechanisms therefor

Description: Class 11: GAS FIRED HEATERS; VENTILATORS; FURNACES; AIR SUPPLY AND EXHAUST FANS AND BLOWERS; AIR CURTAINS; AIR WASHERS;[ REFRIGERATORS;] ENERGY RECOVERY AIR HANDLING UNITS;[ OIL HEATERS;] ELECTRIC HEATERS; AND AIR CONDITIONERS
Class 37: MAINTAINING GAS FIRED, OIL FIRED AND ELECTRIC AIR HEATING AND AIR CONDITIONING EQUIPMENT, HEAT TRANSFER AND VENTILATING DEVICES

Description: Class 11: GAS FIRED AIR HEATERS AND VENTILATORS; GAS FIRED HEATERS AND FURNACES, AIR SUPPLY AND EXHAUST FANS AND BLOWERS, AIR CURTAINS AND AIR WASHERS; REFRIGERATORS; ENERGY CONSERVATION DEVICES, NAMELY, ENERGY RECOVERY AIR HANDLING UNITS; OIL HEATERS; ELECTRIC HEATERS AND AIR CONDITIONERS
Class 37: MAINTAINING GAS FIRED, OIL FIRED AND ELECTRIC AIR HEATING AND AIR CONDITIONING EQUIPMENT, HEAT TRANSFER AND VENTILATING DEVICES

Description: Class 11: GAS FIRED AIR HEATERS AND VENTILATORS; GAS FIRED HEATERS AND FURNACES, AIR SUPPLY AND EXHAUST FANS AND BLOWERS, AIR CURTAINS AND [ AIR WASHERS; ] REFRIGERATORS; [ ENERGY CONSERVATION DEVICES, NAMELY, ] ENERGY RECOVERY AIR HANDLING UNITS; OIL HEATERS; ELECTRIC HEATERS AND AIR CONDITIONER
Class 37: MAINTAINING GAS FIRED, OIL FIRED AND ELECTRIC AIR HEATING AND AIR CONDITIONING EQUIPMENT, HEAT TRANSFER AND VENTILATING DEVICES