Techniques and teaching of P.H.D. is a site where you will find all kinds of used machinery in the field of public works (drilling machines, earthmoving equipment, etc.). You will also find a section that explains the operation of Horizontal Directional Drilling. P.H.D. is a technique used to create tunnels in projects where it is necessary to cross a road, street, river, railway, or simply to avoid digging trenches.
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