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| قاعدة منحدرة ؛منتظم الإنحدار ؛سطح مائل | |||
| English thesaurus | |||
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| the opening in a derrick derrick window with the shape of an inverted V (that is located opposite the drawworks and above the pipe rack on a drilling rig. The V-door is used to pull drillpipe or casing from the pipe racks onto the drill floor.) | |||
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