| http://www.w3.org/ns/prov#value | - The mast, which is disposed in a generally vertical position during the drilling operation, is usually pivoted near its lower end to the vehicle for movement to a generally horizontal position when the vehicle is being transported over a road or other terrain so that it may clear overhead obstructions, lower the center of mass of the vehicle, and more securely affix the mast to the vehicle during
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