Mast 04
Mast 04 :
A portable derrick capable of being erected as a unit, as distinguished from a standard derrick which cannot be raised to a working position as a unit. Used for well drilling or well work-over. (WLOP)
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A portable derrick capable of being erected as a unit, as distinguished from a standard derrick which cannot be raised to a working position as a unit. Used for well drilling or well work-over. (WLOP)