| http://www.w3.org/ns/prov#value | - The adjustable bar member B comprises an extruded metal member formed from a suitable metallic material such as aluminum or other metal, with wall thicknesses of around 1/16 or so similar to those of the base member A. In the preferred embodiment of the invention shown in FIGS. 1-3, the elongated bar member B is in the form of a generally inverted downwardly opening channel-shaped member formed b
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