| http://www.w3.org/ns/prov#value | - BRIEF DESCRIPTION OF THE DRAWINGS [0024]FIG. 1 is a side view of an underground boring apparatus in accordance with an embodiment of the present invention; [0025]FIG. 2 depicts a closed-loop control system comprising a first control loop and an optional second control loop as defined between a boring machine and a boring tool according to the principles of the present invention; [0026] FIGS. 3A-3E
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