A material conveying system capable of traversing a floor along a curvilinear path, the system comprising a plurality of framework members arranged in tandem on the surface along a portion of the path to form an elongated longitudinally extending conveyor train; and connector means on each framework...http://www.google.fr/patents/US6651804?utm_source=gb-gplus-shareBrevet US6651804 - Self-propelled articulated conveyor system
