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"Un tapón corona perfeccionado", que se caracteriza por comprender dos cuerpos independientes, uno de los cuales está constituido en obturador, mientras que el otro lo forma una cápsula de cierre que cuenta en su superficie con una lengüeta, la cual, al ser rasgada manualmente, provoca la rotura de la cápsula por las zonas en que se unen ambas, cuya cápsula cuenta además con varios nervios mediante los que se refuerza su resistencia mecánica.