[Class : 11] Distillation Apparatus; Distillation Columns; Flare Stacks For Use In The Oil Industry; Air Dryers; Recuperators For Pre Heating Combustion Air In Heating Systems By The Use Of Hot Flue Gas; Loading Apparatus For Furnaces; Heat Exchangers For Chemical Processing; Vacuum Distillation Columns For Industrial Use; Chromatography Columns For Industrial Use; Chemical Fibre Drying Apparatus; Distillation Apparatus For Chemical Processing; Waste Water Treatment Apparatus; Waste Water Treatment Installations; Waste Water Treatment Tanks; Water Treatment Units For Aerating And Circulating Water; Sewage Treatment Plants; Water Distribution Installations; Electric Outdoor Heaters; Flues For Heating Boilers; Feeding Apparatus For Heating Boilers; Heat Exchangers; Distillation Columns; Pressurized Water Tanks; Furnace Boilers; Heating Furnaces; Casting Furnaces; Industrial Furnaces; Electric Furnaces; Furnace Ash Boxes; Furnaces (Loading Apparatus For); Heating Apparatus For Furnaces; Damping Apparatus (Parts Of Furnaces); Recuperators For Chemical Processing; Recuperators For Pre Heating Combustion Air In Heating Systems By The Use Of Hot Flue Gas; Ash Conveyor Installations, Automatic; Sewage Treatment Plants; Biological Reactors For Clarifying Industrial Effluents; Water Distribution Installations; Pressure Vessels For Sterilising.