| http://www.w3.org/ns/prov#value | - The following is a description, by way of example, of certain constructions in accordance with the invention, reference being made to the accompanying drawings, in which: FIGURE 1 is a diagrammatic side elevation of one construction, FIGURE 2 is a diagrammatic side elevation showing the run of cables and chains in the construction shown in FIGURE l, FIGURE 3 is a front elevation of the constructio
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