| http://www.w3.org/ns/prov#value | - Below the bottom wall of the base or enclosure 55 means for supporting the unit are provided, preferably including a pair of laterally spaced wheels 56, and a pair of downwardly projecting spaced side wall elements 57, which may conveniently take the form of triangular pieces, with one corner of each presented downwardly to provide for support as on the floor indicated at F in FIG. 7.
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