− | Brevetto per una matita meccanica. Riferimenti a {{MentionApplication|1934-07-02|733524}}, {{MentionApplication|1935-08-20|37089}}, {{MentionApplication|1937-11-01|172245}} e {{MentionApplication|1938-09-24|231584}}. | + | Brevetto per una matita meccanica. Riferimenti a {{MentionApplication|1934-07-02|733524}}, {{MentionApplication|1935-08-20|37089}}, {{MentionApplication|1937-11-01|172245}} e {{MentionApplication|1938-09-24|231584}}. |