1. 
   jackup drilling rig
   a mobile bottom-supported offshore drilling structure with columnar or open-truss legs that support the deck and hull. When positioned over the drilling site, the bottoms of the legs rest on the seafloor. A jackup rig is towed or propelled to a location with its legs up. Once the legs are firmly ...
   Found op http://www.encyclo.co.uk/visitor-contributions.php
   
   
2. 
   jackup drilling rig
   a mobile bottom-supported offshore drilling structure with columnar or open-truss legs that support the deck and hull. When positioned over the drilling site, the bottoms of the legs rest on the seafloor. A jackup rig is towed or propelled to a location with its legs up. Once the legs are firmly ...
   Found op http://www.encyclo.co.uk/visitor-contributions.php
   
   

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