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Cierre perfeccionado para frascos caracterizado esencialmente por estar constituido por un elemento capsular cuyo diámetro interior es ligeramente superior al diámetro exterior del frasco a obturar estando provisto dicho elemento capsular en su cara interior de una pieza en U invertida solidaria del mismo y cuyos brazos son ligeramente divergentes formando muelle y con ser das terminaciones ligeramente convergentes.