− | Brevetto per un pennino economico. Riferimenti a {{MentionPatent|US|2037699}}, {{MentionPatent|US|2159002}}, {{MentionPatent|US|2159003}}, {{MentionPatent|US|2228250}}; {{MentionPatent|US|2011516}}, {{MentionPatent|US|2149557}}, {{MentionPatent|US|776951}}, {{MentionPatent|US|2329996}}, {{MentionPatent|US|2316478}}, {{MentionPatent|US|1284525}}, {{MentionPatent|US|1335580}}, {{MentionPatent|US|1917185}}, {{MentionPatent|US|2252907}}, {{MentionPatent|US|2305287}}, {{MentionPatent|US|2316479}} e {{MentionPatent|US|2328116}}, ed inoltre {{MentionPatent|GB|191126585}}. | + | Brevetto per un [[Used for feature::pennino]] estremamente economico composto da due striscioline di metallo. Riferimenti a {{MentionPatent|US|2037699}}, {{MentionPatent|US|2159002}}, {{MentionPatent|US|2159003}}, {{MentionPatent|US|2228250}}; {{MentionPatent|US|776951}}, {{MentionPatent|US|1284525}}, {{MentionPatent|US|1335580}}, {{MentionPatent|US|1917185}}, {{MentionPatent|US|2011516}}, {{MentionPatent|US|2149557}}, {{MentionPatent|US|2252907}}, {{MentionPatent|US|2305287}}, {{MentionPatent|US|2316478}}, {{MentionPatent|US|2316479}}, {{MentionPatent|US|2328116}} e {{MentionPatent|US|2329996}}, ed inoltre {{MentionPatent|GB|191126585}}. |