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Aparato gimnástico, caracterizado por que está constituido por una guía recta de acero, rodeada en su parte central por un resorte helicoidal, que apoya por sus extremos en piezas deslizables las cuales, presentan: por el lado del resorte, platillos de apoyo para el mismo, y a continuación partes torneadas, en las que encajan manguitos destinados a ser cogidos con las manos y sujetos a su vez por arandelas, fijadas por pasadores en los extremos de dicha guía.