20 Furniture, school furniture and furniture for offices, including the following products: plates, benches, chairs, tables, cupboards, counters and seats for schools or offices, as far as the aforesaid goods are included in this class; profile frames, rails, chains and screws, stands, stakes of non-metallic materials, in particular the aforesaid goods being components and aids for the suspension or positioning of information and planning boards, of projection screens, of projection modules and of other information transmission aids; cupboards for use in relation to the following goods: audio-visual apparatus, projectors, sound equipment, information boards and other teaching or instructional materials; boards for the display of information, all aforesaid goods not included in other classes.