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Nivel perfeccionado, de los comprendidos por una regla soporte, portadora de una o más cápsulas de burbuja, ortogonales entre si y alineada una de ellas al eje de simetria de la regla portadora, caracterizada, porque la citada regla ésta construida por un segmento de un perfil extrusionado en forma de "I", el cual presenta en su tramo de unión, sendos orificios octogonales pasantes, situados uno en el punto medio longitudinal y, otro, rrdximo a uno de sus extremos, presentando dos de sus lados paralelo al de sus lados.