Pen mata bola: Perbezaan antara semakan
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Baris 349:
* [http://www.ideafinder.com/history/inventions/story055.htm A history of the ballpoint pen].
* [http://news.bbc.co.uk/2/hi/uk_news/magazine/6173154.stm ''Did Biros really revolutionise writing?''] – [[BBC News]] – 24 October 2006
* [http://jewish.hu/view.php?clabel=biro_laszlo Laszlo Biro on Jewish.hu's list of famous Hungarians] {{Webarchive|url=https://web.archive.org/web/20130522234407/http://jewish.hu/view.php?clabel=biro_laszlo |date=2013-05-22 }}
* [http://www.theballpointer.com/headlines.html ''The Ballpointer'' online journal covering ballpoint pen artwork]
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