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Who was Ladislao José Biro, how did he invent the ballpoint pen and how did it help in World War II?

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Who was Ladislao José Biro, how did he invent the ballpoint pen and how did it help in World War II?You may not realise this but the humble ballpoint pen, used by millions of people around the world every day, is less than eight decades old. Invented as the Second World War was about to begin in... (más)

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