73140954
Sep 12, 1977
Apr 4, 1978
DUCTS; PIPES; ELBOWS; T'S AND CONNECTING FITTINGS FOR DUCTS AND PIPES; PIPE AND DUCT HANGERS AND CLEATS; PIPE AND DUCT EXTENSIONS; DAMPERS; STACK HEADS; FORCED AIR TRANSITION BOOTS; T-JOINT CAPS; DRAFT DIVERTERS; REGISTERS; GRILLES; AND COLLARS; ALL OF PREFABRICATED METAL FOR USE IN HEATING AND AIR CONDITIONING
Environmental Control Apparatus