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Initially, also for the greater facility of working, it was realized in cylindrical form with flat ends (the so-called ''[[flat top]]'') but following the evolution of the stylistic tendencies it has been passed to more tapered forms (with the birth of the so-called ''[[streamlined]]'' style). Moreover, with the evolution of stylistic trends from the ordinary round section, we have moved to multifaceted, triangular, square, octagonal, dodecagonal forms, etc.  
 
Initially, also for the greater facility of working, it was realized in cylindrical form with flat ends (the so-called ''[[flat top]]'') but following the evolution of the stylistic tendencies it has been passed to more tapered forms (with the birth of the so-called ''[[streamlined]]'' style). Moreover, with the evolution of stylistic trends from the ordinary round section, we have moved to multifaceted, triangular, square, octagonal, dodecagonal forms, etc.  
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Oltre al differenziarsi per le varie forme adottate dai produttori, il corpo ha subito anche l'evoluzione nell'uso dei [[materiali]] impiegati nella costruzione delle stilografiche, di cui appunto costituisce il componente più grande. Agli albori delle stilografiche era prevalentemente costruito in [[ebanite]] come il resto della penna, materiale che garantiva, dovendo servire da serbatoio dell'inchiostro, la necessaria resistenza chimica.  
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In addition to differentiating itself for the various forms adopted by the producers, the barrel has also undergone the evolution in the use of the [[materials]] used in the construction of the fountain pens, of which it constitutes the largest component. At the dawn of the fountain pens it was mainly made of [[hard rubber]] like the rest of the pen, a material that guaranteed, having to serve as an ink tank, the necessary chemical resistance.  
    
Con lo sviluppo della tecnologia sono stati utilizzati poi tutti gli altri [[materiali]], a partire dal [[metallo]] (le prime furono probabilmente le [[Wahl Metal Pen]]), alle prime resine artificiali come [[bachelite]], [[galalite]] e [[celluloide]], per passare negli anni '40 alle più comuni [[resine plastiche]] in uso ancora oggi.  
 
Con lo sviluppo della tecnologia sono stati utilizzati poi tutti gli altri [[materiali]], a partire dal [[metallo]] (le prime furono probabilmente le [[Wahl Metal Pen]]), alle prime resine artificiali come [[bachelite]], [[galalite]] e [[celluloide]], per passare negli anni '40 alle più comuni [[resine plastiche]] in uso ancora oggi.