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Priority to ES0273957ApriorityCriticalpatent/ES273957A3/en
Publication of ES273957A3publicationCriticalpatent/ES273957A3/en
Improvements in the retractable mechanisms of pens, characterized by the fact that near the lower end of the feeding tube supporting the writer tip, an annular projection is provided on which rests the upper terminal of a spiral expansion spring, whose The lower terminal is supported by a suitable point provided inside the mechanism casing. (Machine-translation by Google Translate, not legally binding)
ES0273957A1962-01-221962-01-22Improvements in retractable bolºgrafos mechanisms (Machine-translation by Google Translate, not legally binding)
ExpiredES273957A3
(en)