Elpusztítani mész Szagtalan who invented ball pen Fennsík Bilincs sűrűsödik
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The ball-point pen was invented by the Hungarian painter and... News Photo - Getty Images
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The cheap pen that changed writing forever - BBC Future
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Who invented the Ball Point Pen? Is it Biro Brothers, Waterman Brothers, Bicc Brothers, or Write Brothers? - Quora
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