A modular shelving assembly has at least three spaced poles, each having a connector, a first post unit and a second post unit. Each post unit has first and second opposing ends, with a first protrusion extending radially inwardly from the hollow interior surface of the first post unit adjacent the first...http://www.google.fr/patents/US6260488?utm_source=gb-gplus-shareBrevet US6260488 - Modular shelving
