| http://www.w3.org/ns/prov#value | - The groove(s) may be, for example, of tapering V-shape and will, for convenience, hereafter be referred to as ???V-grooves??? and the valves of this general type as ???V-groove valves???, although it will be appreciated that the grooves may, if desired, have a different tapering cross-section, e.g. of circular, rectangular or other shape.
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