Card holder extrusion

A card holder assembly including a card holder extrusion adapted to be mounted on a conventional card holder located in front of a shelf, the card holder assembly comprising in combination:

• at least one adapted to be removably mounted in a card holder extrusion, the card consisting of a sheet of flexible material having such stiffness characteristics to be easily foldable while keeping afterward its folded shape, said sheet having a free end, a front face, a rear face and a hooking tongue provided with a pair of parallel longitudinal edges that are spaced apart from each other at a given distance d.sub.1, the hooking tongue being formed by folding a portion of the sheet containing said free end over its rear face so that one of said longitudinal edges of the tongue is defined where the sheet is folded while the other longitudinal edge of said tongue is defined by said free end of the sheet;
• the card holder extrusion adapted to be mounted on a conventional card holder located in front of a shelf comprising:
• (a) a flat body having a front face, a rear face and parallel longitudinal upper and lower edges;
• (b) an upper and a lower member each having longitudinal upper and lower edges that are parallel with longitudinal edges of the flat body, said upper member having one longitudinal upper edge integral with the flat body, and the longitudinal lower edge, together with at least a portion of the upper member, being spaced from the front face to define an upper groove having a top and an opening,
• said lower member having one longitudinal lower edge integral with the flat body, and the longitudinal upper edge, together with at least a portion of the lower member, being spaced from the front face to define a lower groove having a bottom and an opening,
• the openings of each groove being mutually facing and, at a given distance from each other,
• the bottom of the lower groove being at a given distance d.sub.2 from a lower edge of the upper member contributing to define the opening of the upper groove and
• the top of the upper groove being at a given distance d.sub.3 from an upper edge of the lower member contributing to define the opening of the lower groove,
• distance d.sub.2 and d.sub.3 being adapted to the following relationship:
• d.sub.3 >d.sub.1 >d.sub.2
• (c) means for fastening said flat body on a conventional card holder.