A product shelf unit specially adapted for yogurt cups and the like, includes a metal base bracket that attaches to a horizontal rectangular bar. A plastic tray is slidably received on the base bracket which has two elongated walls which slide within the hollow interior of elongated walls in the tray....http://www.google.fr/patents/US7690519?utm_source=gb-gplus-shareBrevet US7690519 - Extendable product shelving
