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Oxigeno - - TECNICA -

So­bre la cuer­da en do­ble co­lo­ca­re­mos un nu­do au­to blo­quean­te, ti­po Ma­chard, uni­do al ani­llo­ven­tral del ar­nés me­dian­te un mos­que­tón de se­gu­ri­dad.

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