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Hacking at Random 2009 http://www.har2009.org/ International technology & security conference. Four days of technology, ideological debates and hands-on tinkering. On August 13-16, 2009 the 20th anniversary edition of the four-yearly Dutch outdoor technology-conference will take place near Vierhouten, NL.
The numbers are accumulated, starting at 0 at the begining of the period.