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Mechanical Pencils And Projecting And Retracting Systems Therefor, And Multi-System Writing Instruments
(AREA)
Pens And Brushes
(AREA)
Abstract
Un bolígrafo perfeccionado, caracterizado por el hecho de que el vástago-bolígrafo vaya provisto de una base plana saliente del nivel del cilindro de mayor diámetro del vástago, cuya base soportará la presión constante de un muelle espiral, y la presión accidental de un tapón.