| http://www.w3.org/ns/prov#value | - A nominal clearance of 0.005??? may be provided to allow sliding of mating member 40 along rail 30 like a drawer in a drawer slide. [0037] One or both of rail 30 and mating member 40 can be made from a flexible, low friction (???slippery???), plastic material, such as polyethylene, Teflon, or polypropylene to provide a low coefficient of friction between the members as they slide relative to one a
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