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GEOPROBE OPERATION <br /> CATEGORY: GEO 4.12 March 1998 <br /> L i <br /> Derrick Assembly <br /> O <br /> Probe Shield <br /> Hammer <br /> OO ic <br /> Grease Zires <br /> (2 on each side) <br /> Hammer Rotation Control <br /> Hammer Latch <br /> Tool Rack Control Panel <br /> Pilot Light <br /> O O <br /> O O Electrical Control <br /> O O (3 position) <br /> O O <br /> Derrick Slide <br /> Probe Cylinder Shaft <br /> 1 14 Probe Foot <br /> Figure 2 Front View of Inspection Points on the Hydraulic Unit <br /> 6 <br />