Abstract: A robotic materials handling system for storing and handling box-like articles such as videocassettes includes a storage area containing a plurality of columns of storage bins, a vertical support shaft located adjacent the storage area and a manipulator assembly carried on the shaft. The manipulator assembly includes a plurality of gripper mechanisms which may be positioned adjacent desired storage bins. The system includes computer control circuitry for controlling the operation of the manipulator assembly and gripper mechanism to transport articles between desired locations.