Chelmsford-based Brooks Automation Inc., which supplies semiconductor manufacturers, said fiscal fourth-quarter profit fell 50 percent as revenue dropped compared with a strong quarter a year ago. The company said net income fell to $12.1 million, or 19 cents per share, compared with $24.2 million, or 38 cents, a year earlier. Revenue fell 27 percent to $131 million from $181.6 million. Analysts expected 27 cents on revenue of $139.6 million. Chief executive Stephen Schwartz said the business was hurt by the challenging economy, but it is still pleased with the results.
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