John Barry, who made a San Diego product called WD-40 into a national sensation by "breaking all the Harvard Business School rules," died recently in La Jolla, Calif., of pulmonary fibrosis. He was 84. Barry's business genius during three decades at the company was in emphasizing brand loyalty for a lubricant that fights rust and eliminates squeaks. He preached the value of staying focused on your product and your market, and not being distracted.
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