| 摘要 |
<p>A telescoping boom assembly having novel and inexpensive apparatus for extending and retracting the boom assembly and for extending and retracting an articulated pipeline mounted on the boom assembly. A total of three winches can be used to move a multiple section boom assembly between a retracted position and an extended position regardless of the number of movable boom sections, and the same three winches can independently move the articulated pipeline between a folded and an extended position.</p> |
