Subject based searching using automatically ex-tracted metadata

A refrigerator shelf assembly for moving a plurality of cantilevered vertically stacked adjustable shelves to a staggered extended position by a pair of composite stringer linkage mechanisms each pivotally supported in spaced relation to the refrigerator and movable in parallel vertical planes in a pantograph manner while maintaining the shelves in horizontally disposed relation, together with actuator means for automatically moving the shelves.