73642080
Jan 30, 1987
Jan 12, 1988
CONTROLS FOR APPARATUS CONCERNED WITH THE CONDITIONING, CONTROL AND HANDLING OF AIR
Electrical and Scientific ApparatusAIR DISTRIBUTION GRILLES, REGISTERS, DIFFUSERS (FIXED OR ADJUSTABLE), VENTILATING LOUVERS, GRILLES, AIR VOLUME CONTROL DAMPERS, FIRE RELIEF AND BACKDRAFT DAMPERS, ROOF VENTILATORS, MANUAL AIR TURNING AND CONTROL DEVICES, LOUVER AND DAMPER BLADES AND PARTS THEREFOR CONCERNED WITH THE CONDITIONING, CONTROL AND HANDLING OF AIR
Environmental Control Apparatus