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Priority to ES0005773UpriorityCriticalpatent/ES5773U/es
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Porque se compone de una base sobre la cual va sujeta una tapa formada de dos cuerpos uno mayor y otro menor efectuándose la unión de estos cuerpos por medio de una bisagra con muelle de tal modo que al presionar una pieza situada en el soporte la tapa se levanta sola; estando en dicha tapa impreso el índice alfabético y habiendo a la derecha da cada letra un punto hundido sobre el que se detiene el cursor.