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telescopic derrick

A drill derrick divided into two or more sections, made so that the uppermost sections nest successively into the lower sections. In use, the sections are extended and locked into place to form a tall derrick and when moved are nested to form a unit length transportable on a single truck.

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  • ed.young
  • (Milwaukee, United States)

  •  (V.I.P) 21084 puntos
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