72026210
Mar 14, 1957
Jan 7, 1958
FURNACES, INCLUDING FLOOR AND WALL FURNACES; BOILERS; GAS BURNERS; HUMIDIFIERS; AIR SUPPLY DUCTS FOR ROOM HEATING, COOLING OR VENTILATING SYSTEMS; AIR-FLOW VELOCITY AND SOUND ATTENUATORS FOR FORCED AIR HEATING, COOLING OR VENTILATING SYSTEMS; AND OUTLET DIFFUSERS AND GRILLS FOR SUCH SYSTEMS
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