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Priority to ES0000664UpriorityCriticalpatent/ES664Y/en
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Publication of ES664YpublicationCriticalpatent/ES664Y/en
Construction of the beams in a single piece, characterized by the square cut made in one of the planes of an angled iron and as a consequence, the step support of the vertical side on the horizontal of the spar. (Machine-translation by Google Translate, not legally binding)