73151089
Dec 5, 1977
Apr 8, 1980
AIR-HANDLING AND AIR-MOVING EQUIPMENT FOR HEATING, AIR CONDITIONING, AND VENTILATION-NAMELY, FAN ASSEMBLIES, BLOWER ASSEMBLIES, FAN BLADES AND PROPELLERS, BLOWER WHEELS, VENTILATORS, HUMIDIFIERS, AND PARTS AND FITTINGS FOR THE ABOVE
Environmental Control Apparatus