by means of magnets

Full Title

Manually or mechanically operated educational appliances using elements forming, or bearing, symbols, signs, pictures, or the like which are arranged or adapted to be arranged in one or more particular ways (puzzle-games A63F9/00; advertising or displaying in general G09F) > and having a support carrying or adapted to carry the elements > the elements each bearing a single symbol or a single combination of symbols > and being attachable to, or mounted on, the support > by means of magnets