| http://www.w3.org/ns/prov#value | - (a) means for fixedly incorporating or attaching at least the top and bottom of said track assembly to the rear of the item to be hung; (b) a vertically sliding interface, said interface including means for engaging with said horizontal support member in a horizontally sliding manner; (c) a substantially continuous vertical length of track along which said vertically sliding interface can slide; a
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