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TECHNOLOGY ASSESSMENT FOR DOWNHOLE VIBRATION MONITORING & CONTROL SYSTEM CONTRACT NO. DE-FC26-02NT41664 Prepared by Martin E. Cobern, Ph.D. Principal Author APS Technology, Inc. Cromwell, CT Prepared for U.S. Department of Energy National Energy Technology Laboratory 3610 Collins Ferry Road Morgantown, WV 26507-0880 November 19, 2004