| http://www.w3.org/ns/prov#value | - Referring now to the drawing in detail, and particularly to Figs. 1 and 2, the reference character l designates a wall or casing associated with any suitable electrical appliance (not shown) which may, for example, be a vacuum-cleaner, a washing machine, an electric heater, or, in fact, any electrical appliance whatsoever. .
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