| http://www.w3.org/ns/prov#value | - Means for conveniently storing the plug-in extension 12 may take the form of a container 62 (FIG. comprising a generally cup-shaped body of electrically conductive material such as aluminum provided with a slip-on closure cap 63 also of dielectric material and provided with a central projection 64 simulating the projecting central pole of a battery.
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