Sigma-Aldrich Corporation Announces 1st Quarter 2009 Earnings Conference Call

ST. LOUIS, April 9, 2009 (GLOBE NEWSWIRE) -- Sigma-Aldrich Corporation (Nasdaq:SIAL), will hold its quarterly conference call to discuss first quarter results on Thursday, April 23, 2009, at 11:00 a.m. Eastern Time (10 a.m. Central Time).
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