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Priority to ES1967130899UpriorityCriticalpatent/ES130899Y/es
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Publication of ES130899YpublicationCriticalpatent/ES130899Y/es
Un tornillo perfeccionado, caracterizado esencialmente por el hecho de presentar en la base de su cabeza, una pluralidad de relieves de forma trapecial, radialmente dispuestos y concurrentes en un núcleo igualmente saliente, operativamente dispuestos para recibir a una llave de maniobra.