| http://www.w3.org/ns/prov#value | - Shown best in FIGS. 5 and 6, the channels 36 and 37 each include parallel spaced sides that are separated by a web, with both sides, above the platform rear wall, shown as including pairs of aligned spaced holes 38 formed therein, which pairs are for receiving at least one pin 39 fitted through the aligned holes 38.
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