the opening in a derrick with the shape of an inverted

the opening in a derrick with the shape of an inverted: General subject: (derrick window) V-door (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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List of Chinese inventions — A bronze Chinese crossbow mechanism with a buttplate (the wooden components have … Wikipedia
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