− | Brevetto per un alimentatore. Riferimenti a {{MentionPatent|US|467785}}, {{MentionPatent|US|834541}}, {{MentionPatent|US|1107641}}, {{MentionPatent|US|1574930}}, {{MentionPatent|US|1938314}}, {{MentionPatent|US|2292381}}, {{MentionPatent|US|2337343}}, {{MentionPatent|US|2375770}} e {{MentionPatent|US|2380763}}, ed inoltre {{MentionPatent|GB|412610}} e {{MentionPatent|GB|473175}}. | + | Brevetto per un [[Used for feature::pennino]] e relativo [[Used for feature::alimentatore]] facilmente intercambiabili. Riferimenti a {{MentionPatent|US|467785}}, {{MentionPatent|US|834541}}, {{MentionPatent|US|1107641}}, {{MentionPatent|US|1574930}}, {{MentionPatent|US|1938314}}, {{MentionPatent|US|2292381}}, {{MentionPatent|US|2337343}}, {{MentionPatent|US|2375770}} e {{MentionPatent|US|2380763}}, ed inoltre {{MentionPatent|GB|412610}} e {{MentionPatent|GB|473175}}. |