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Yesterday marked 111 years since Eduard Slavoljub Penkala patented the world's first mechanical pen. The Croatian engineer and inventor of Polish-Dutch origin is one of the most significant inventors from the beginning of the 20th century. Shortly after the invention of the first mechanical pen, he patented the first fountain pen with solid ink. After a series of patents, in 1911 Penkala was in Zagreb's Branimirova Street ...
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