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136:"Chicago boom derrick" means a boom which is attached to a structure, an outside upright member of the structure serving as the mast, and the boom being stepped in a fixed socket clamped to the upright. The derrick is complete with load, boom, and boom point swing line falls.
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699:Grúa Derrick
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102:You can help
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479::
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Text is available under the Creative Commons Attribution-ShareAlike License. Additional terms may apply.
