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 "A" frame
pwr.lines. A-stolpe
 English thesaurus
 A-frame ['eɪ'freɪm]
O&G an A-shaped lifting device; the A-shaped, highest portion of a standard derrick on a drilling rig that is used to support the crown block; the stationary, A-shaped structure that supports and anchors in upright position the mast of a jackknife rig on a drilling rig