Hydraulics Power New Digger Derrick to Higher Levels (.PDF Download)

Although utilities in new residential neighborhoods generally are buried underground for aesthetic reasons, utility poles with suspended wires still are used extensively in commercial, industrial, and rural areas. In these applications, above-ground poles and wires are much faster and less expensive to install than underground lines.

Machines known as digger derricks bore holes into the ground for the poles and place them into the holes. Digger derricks are similar to truck-mounted cr

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