| http://www.w3.org/ns/prov#value | - The features and advantages of this invention will appear more completely and clearly from the following description given by way of example with reference to the accompanying drawings, in which: FIGURE 1 is a section taken across the steel core; FIGURES 2 and 3 are cross-section and front elevational views, respectively, of a light-alloy section, and FIGURE 4 shows in cross-section an upright con
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