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Keywords: Delayed Coker.jpg en Photograph of a 4-drum delayed coking unit in a petroleum refinery http //www secinfo com/dsvrp uEe6 d htm Valero Energy Corporation 2007-07-09 The photo was included in a brochure submitted to the Securities Exchange Commission SEC by the Valero Energy Corporation as part of an 8-K Report The SEC is a U S Federal agency PD-USGov Chemical equipment Oil refineries Petroleum refining |