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Mar 24, 2009 · The program applies to all supervisors in the 'black trades' (scaffolding, rigging, welding, crane operations etc). What is there to misunderstand about that? gzzzz asked what the black trades. Nov 7, 2008 · Grua is a good translation for crane, which is a machine with structural arm for lifing and can incorporate components such as winches. Nota de moderador: comentario editado para eliminar.
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