An unmanned guided vehicle (10) is propelled along a path (P) by a traction mechanism. Movement of the vehicle (10) on the path is controlled by a first control. The vehicle (10) includes storage (40) for storing at least one container (30) and transfer mechanism (44) mounted for vertical movement on...http://www.google.de/patents/US4492504?utm_source=gb-gplus-sharePatent US4492504 - Materials handling system
