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Libreta sorpresa, caracterizada por poseer en su interior un dispositivo integrado por una anilla, gomas y un alambre en forma de "U" capaz de acumular energía en estado de cierre y desarrollarla en el momento de apertura al hacerse posible el giro sobre si misma de la anilla sujeta Mediante las gomas a los extremos de los brazos del alambre en forma de "U".