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7777, <br /> GEOPROBE OPERATION <br /> CATEGORY: GEO 4.12 - March 1998 <br /> Derrick Assembly <br /> Probe Cylinder <br /> Foot Cylinder <br /> Hammer <br /> Fold Cylinder <br /> 0 <br /> o p <br /> D <br /> Extension Cylinder <br /> Probe Foot <br /> Figure 1 Side View of Inspection Points on the Hydraulic Unit <br /> 5 <br />