Abstract: A card holder extrusion mounted on a conventional card holder located in front of a shelf. One or more cards with a hooking tongue having a pair of parallel longitudinal edges are removably mounted on the conventional card holder. This card holder extrusion includes a substantially flat body having a front face, a rear face and parallel longitudinal upper and lower edges. The flat body is fastened to a conventional card holder. A card is removably mounted in the card holder extrusion. A card holder assembly results from the combination of one card holder extrusion and at least one card. A method for removably mounting the card holder extrusion on a conventional card holder and a method for mounting and removing a card from the card holder extrusion is also disclosed.

Abstract: A container is useful in a sign board in which certain display elements have to be changed from time to time. The container is provided with element for preventing a stack of display sheets contained therein from accidentally slipping out. There is a sign board in which at least certain elements have to be changed from time to time, and these elements are housed in one or several of these containers. These containers are positioned and locked, on at least one face of a flat body which is part of the sign board, between a pair of parallel guiding bars connected to the body. The sign board can be provided with element for removably fastening it to a base in order to keep the sign board in a substantially vertical position.