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Downhole Technology, Ltd. Instrumented Surface Sub DOE Project (DE-FC26-03NT41782) To refine and field test the Instrumented Surface Sub, and collect critical drilling data during the field tests to begin development of algorithms to process these critical data so penetration rate can be optimize and BHA life can be maximized. What Is Instrumented Sub  Data Collection Device  Fits In Drill String Below Top Drive  Measures Critical Drilling Parameters  Wireless Communications To Computer  Enhancement To Drilling Performance  Prevents Damage To Drill String & BHA