A mobile body is configured to travel over a surface inside an aircraft cabin. If a first storage device fails, a rebuild controller executes a rebuild process to store the same data as recorded in the first storage device in a spare storage device. The hook is capable of pivotable movement between a retracted position and an extended position. A cavity in the intermediate plate is filled with a melted material supplied via a sprue and a runner. The out member of each barrel is comprised of a rigid material such as, but not limited to, a filled plastic. There is also provided a process for the preparation of such a formulation.