A manufacturing facility includes a storage facility and a production facility. Workpieces are located in the storage facility in temporary storage accommodations, and are moved between the storage facility and stations in the production facility by mobile carrier units. The temporary storage accommodations may be units having a generally circular lading envelope, and an hexagonal optimal packing density. The optimal packing density is such that supports for the accommodation units lies outside the lading envelope circle, but within the corner regions of the hexagons of the packing density pattern. The accommodation units have lifting fittings that are accessible from the corners of the hexagons, whether the same as those of the supports, or different ones. The mobile carrier units may be automated guided vehicles The guided vehicle may be electronically controlled to prick up and deliver workpieces from one location to another, and may include self-navigating software, and interactive communication with other guided vehicle to permit suitable routes to be chosen, or to permit obstacles to be avoided. The facility may include a vertical degree of freedom, or workpiece retrieval apparatus used for transferring workpieces between the storage accommodations and the automated guided vehicles, or to other locations. The workpiece retrieval apparatus may be mounted on a bridge, and may include a multi-element raising any lowering array that is biased to oppose torsional deflection of the lifting member.