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<p>[QUOTE=&quot;justafarmer, post: 1399086, member: 3926&quot;]They are becoming more common in the scrap metal industry. Mostly with yards that do high volumes of non-ferrous metals. Not only are they expensive to acquire - the spark modules ain&#039;t cheap. They burnout with use and must be replaced regularly. I believe they are made from fine silver.[/QUOTE]</p><p><br /></p>

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