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It appears they are using a more reactive metal, such as zinc, electrically attached to the pipe. It would "soak up" excess electrons generated by stray currents in the structure. Or is that just my hyperactive imagination, Jerome?

"It is not necessary to have hope in order to persevere."
by ARGeezer (ARGeezer a in a circle eurotrib daught com) on Sun Jan 24th, 2010 at 05:13:26 PM EST
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