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MESA , Arizona , July 19, 2007 —Centripetal Dynamics has formed a strategic alliance with Trinity Industries ( to support the development and construction of the company’s proprietary hybrid tower systems. Trinity is the leading US tower manufacture and the leading cement producer in the state of Texas. The strategic relationship with Trinity will focus on engineering and manufacturing of the hybrid concrete / steel tower systems for use in CDI wind farms. Trinity will also support CDI’s manufacturing requirements for its installations throughout Mexico. Trinity Industries current involvement in the development of wind parks in U.S. and Mexico offers CDI a strategic advantage in these markets.

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