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A mast, spar, or tall frame, supported at the top by stays or guys, and usually pivoted at the base, with suitable tackle for hoisting heavy weights, such as stones in building.
The pyramidal structure or tower over a deep drill hole, such as that of an oil well (also called an oil derrick .
A single spar supported by stays and guys, to which a purchase is attached, used to hoist cargo when unloading a vessels.
Swinging spar for moving cargo.
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