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Nuevo calibre, caracterizado esencialmente por el hecho de que en el fondo de la acanaladura que constituye guía de deslizamiento de la corredera a lo largo de la regla, se ha previsto un alojamiento para un resorte laminar ligeramente curvado, que se apoya a presión contra el reverso de la regla, permitiendo el deslizamiento a fricción de la corredera.