| http://www.w3.org/ns/prov#value | - A plurality of rollers 70, which may be made from any suitable material such as nylon or the like, are rotatably mounted in each roller tray 48 on axles 72 mounted in legs 62, 68 and retained in position therein by suitable securement means, such as the pin shown at 74 in FIG. 3.
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