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Sterne Agee Upgrades Quanta Services (PWR) to Buy Jan 19, 2011 08:47AM
Sterne Agee Upgrades Quanta Services (PWR) to Neutral May 7, 2009 10:48AM
Sterne Agee Downgrades Quanta Services (PWR) to Sell Dec 8, 2008 10:52AM