Abstract: A sliding file support to cooperate with a dual access file system having a central longitudinal upwardly open U-channel. At least one side of the channel has an outer surface and at the top of the side a lip with an inner surface. The element comprises a slider and a loop for an end stop. The slider carries two rear, lower legs with inner bearing surfaces; also a third, lower forward leg longitudinally between the other two and with an inward bearing surface. The slider also carries a ledge longitudinally between the rear legs, and a hook longitudinally spaced from the legs. In operation the hook is hooked under the lip of the wall, the ledge rides on the top of the wall, and the bearing surfaces clasp the wall between them in sliding engagement. The body and the support are readily engaged and disengaged.

Abstract: Compact shelving consisting of a cluster of elongated, upstanding stacks of shelves juxtaposed side by side are accessible by mounting each elongated stack on an elongated carriage having rear rollers guided in elongated floor tracks coextensive in length and width with the stack and hidden thereunder. There are plastic tired wheels under the front of the carriage so that the carriage and stack can be moved, endwise on a track out of the cluster to expose the open side shelves. Front shelves increase the storage capacity. A removable crank on the front end, through twist-belt power transmission, advances and retracts each stack.