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Un dispositivo adaptable al lápiz cerca de su punta o mina y provisto de una prolongación que permite alojar una goma de borrar de manera que quede a poca distancia de la mina y de forma que el eje de la goma y el del lápiz formen un ángulo sensiblemente agudo.
ES0010350U1944-07-111944-07-11Portagomas adaptable a lápices y lapiceros.
ExpiredES10350Y
(es)