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<p>[QUOTE=&quot;Whipps, post: 2225962, member: 71975&quot;]I know that the oils break down. In the case of the cables, the rate of break down has to do with voltages. Our 4kv system has nearly 100 year old untouched cables that, when opened up, have pristine, bright red copper. </p><p><br /></p><p>On the other end of the spectrum is the 110kv system which has to be &quot;burped&quot; fairly often to release the built up gases caused from a much more rapid break down. </p><p><br /></p><p>As far as coin grading and TPG policies, you guys have worlds more knowledge than I do. After a brief search online I couldn&#039;t find anything on the topic so I figured I would bring it up. But it seems that the case is closed on this one[/QUOTE]</p><p><br /></p>

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