COLUMBIA, Md., Dec. 18 -- Essex Corp. announced it has received additional funding of $500,000 from a member of its investor group, Hannon Family LLC. The funding was received in the form of a senior debt instrument, convertible to common equity shares through December 2004. The additional funding is part of a near-term operations and funding strategy that emphasizes core business expansion and investment in new technology and products, Essex said. 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