Topical Terminology > Jackknife Or Folding Mast
1 Definition
Jackknife Or Folding Mast
For Jackknife Or Folding Mast we have a term and definition in Oil.
Jackknife Or Folding Mast (Oil) 
The type of mast that can be folded for moving, as opposed to the standard derrick, which has to be completely dismantled and re-erected.
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