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Dispositivo marcador caracterizado porque en el interior del depósito tubular en el que se aloja la masa esponjosa empapada de tinta se han previsto dos nervaduras longitudinales muy próximas entre sí que originan una canal que no es ocupada por la expresada masa constituyendo un paso a través del que puede circular hacia el fondo del depósito el aire exterior que penetra por un orificio provisto en las proximidades de la extremidad opuesta garantizando el necesario equilibrio de presiones entre este fondo y el ambiente exterior.