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http://www.jeuxvideo.com/news/2013/00068272-valve-depose-half-life-3.htm
http://www.jvn.com/actualites/half-life-3-valve-a-depose-la-marque-a1071081
BOOM :
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Voyez par vous-même : http://oami.europa.eu/CTMOnline/RequestManager/en_Result_NoReg (Dans "Trade Mark Name :" tapez "Half Life 3")