Key-Lock ® mechanical Joint © 2012 National Oilwell Varco. All rights reserved. CH7208 supersedes FP1024 - June 2012 www.fgspipe.com • fgspipe@nov.com Economic association “Thermal Power Plants and Mines Kostolac” Ltd. is an energy company operating as part of the Electric Power Industry of Serbia. The company’s basic activity is production of thermal electricity but also produces coal for thermal power plant. TE KO “Kostolac” Ltd. consists

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