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Johnson Controls Inc. is selling its plastic containers division to a unit of German conglomerate Viag under undisclosed terms, but reports estimated the price at as much as $650 million. . . . Enron Corp. said it promoted Jeffrey K. Skilling, chief of its gas and electricity marketing unit, to president and chief operating officer. . . . Campbell Soup Co. said it reached a tentative $114.5-million settlement with a group of retired employees who sued the company after it cut their medical benefits in 1992.