6
Common metals and their alloys; metal building materials; transportable buildings of metal; materials of metal for railway tracks; non-electric cables and wires of common metal; ironmongery, small items of metal hardware; pipes and tubes of metal; safes; goods of common metal not included in other classes; ores
16
Paper, cardboard and goods made from these materials, not included in other classes; printed matter; bookbinding material; photographs; stationery; adhesives for stationery or household purposes; artists' materials; paint brushes; typewriters and office requisites (except furniture); instructional and teaching material (except apparatus); plastic materials for packaging (not included in other classes); printers' type; printing blocks
21
Household or kitchen utensils and containers (not of precious metal or coated therewith); combs and sponges; brushes; brush-making materials; articles for cleaning purposes; metal scouring pads; unworked or semi-worked glass (except glass used in building); glassware, porcelain and earthenware not included in other classes