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Technology Assessment for Fundamental Research on Percussion Drilling: Improved Rock Mechanics Analysis, Advanced Simulation Technology, and Full-Scale Laboratory Investigations CONTRACT NO. DE-FC26-03NT41999 Prepared by Gang Han, PhD Mike Bruno, PhD Principal Authors Terralog Technologies USA, Inc. Arcadia, California Prepared for U.S. Department of Energy National Energy Technology Laboratory 3610 Collins Ferry Road Morgantown, WV 26507-0880