Class 006: [ Ductile iron and iron sold in bulk; alloys used for casting; cast and forged steel sold in bulk; nickel and nickel alloys sold in bulk; building girders, joists and building framing made from steel; transportable buildings of metal; railroad tracks made from metal; non-electric metallic cables and wires; metal locks and keys therefor; metal pipes; metal safes; iron ores; foundry molds and casting forms of metal; wrought iron, semi-wrought iron; foundry screens for controlling grain sizes of mold sand ]; Class 011: [ Electric lighting fixtures; steam generators and steam valves; water conditioning units; waste water purification units; sewage disposal plants; waste recovery systems; incinerators for domestic refuse; furnaces, other than for experimental purposes; loading apparatus for furnaces; structural plates for ovens, oven conveyor belts sold as components for ovens; water cooling tubs; kilns; incineration bars and electrically heated conveyor belts sold as components for incinerators ]; Class 040: Resource recovery of industrial co-products and byproducts containing metals; waste treatment and recovery [; battery recycling ]
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