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<p>[QUOTE=&quot;springfld.arsenal, post: 318512, member: 54&quot;]Im thinking the thick rubber inside lining may be electrical insulation.&nbsp; If so the rollers may be made of nonconducting plastic, at least on the outer surface.&nbsp; If so then I’d say the device is made to support electrical cables on something like a crane that moves somewhat.&nbsp; Next time I get near it I’ll check those rollers carefully.[/QUOTE]</p><p><br /></p>

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