A tray convertable to a picture frame designed specifically for the display of a plurality of baseball cards, photographs, or the like is disclosed. Included is a frame portion including top, bottom, and side struts and one or more vertical and horizontal struts, such that window openings are defined...http://www.google.fr/patents/US4170303?utm_source=gb-gplus-shareBrevet US4170303 - Combination tray and picture frame apparatus
