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Una mejora introducida en el objeto de la Patente principal número 206.243 o sea en una válvula de cierre caracterizada porque el cuerpo obturador tiene una sección hueca alargada en dirección transversal al paso y contiene una inserción rígida cuya altura es menor por lo menos en la medida del recalcado que la profundidad de la cavidad.
ES0209300A1952-05-171953-05-13Mejoras introducidas en el objeto de la pantente principal
ExpiredES209300A2
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