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121:"A-frame derrick" means a derrick in which the boom is hinged from a cross member between the bottom ends of two upright members spread apart at the lower ends and joined at the top; the boom point secured to the junction of the side members, and the side members are braced or guyed from this junction point.
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689:Grúa Derrick
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Text is available under the Creative Commons Attribution-ShareAlike License. Additional terms may apply.
