Key-Lock ® mechanical Joint © 2012 National Oilwell Varco. All rights reserved. CH7217 supersedes FP 963 - June 2012 www.fgspipe.com • fgspipe@nov.com The river Kolubara basin is an area covering three municipalities in Sumadija and Tamnava, with a coal reserve close to 4 billion tons. JP RB Kolubara is the largest coal manufacturer in the state and the most powerful business partner within the Serbian Energetic System (EBS). By the end of

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