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Form SC 13G/A PowerShares Exchange-Tra Filed by: Invesco Ltd. Dec 12, 2011 11:19AM
Form SC 13G PowerShares Exchange-Tra Filed by: Marquette Asset Management Inc. Nov 8, 2011 10:19AM
Form SC 13G PowerShares Exchange-Tra Filed by: TD ASSET MANAGEMENT INC Oct 28, 2011 10:42AM