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Instrumento escritor retráctil, caracterizado esencialmente por el hecho de comprender un barril cuyo extremo de trabajo presenta un orificio cerrado por un obturador que cierra elásticamente y es susceptible de ser atravesado por la punta escritora de un cartucho carga de rotulador, montado deslizante dentro del barril y asociado con un dispositivo de accionamiento para hacer sobresalir o retraer dicha punta.