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Mechanical Pencils And Projecting And Retracting Systems Therefor, And Multi-System Writing Instruments
(AREA)
Abstract
UN PORTALÁPIZ, notablemente mejorado que está caracterizado, por estar constituido, por un pequeño tubo de material plástico, en cuyo interior lleva por la parte superior un muelle-gusanillo y por la parte inferior un lápiz propiamente dicho.