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San Francisco-based Chevron Corp. said it will restructure its computer and information technology unit, Chevron Information Technology Co., cutting as many as 660 jobs and saving $50 million a year. . . . Agoura Hills-based Guitar Center Inc., a national retailer of guitars, amplifiers and other musical instruments and equipment, plans to sell 6.75 million shares in an initial public offering, to be priced between $14 and $16 each, according to an SEC filing. . . . El Segundo-based Merisel Inc. announced that Robert J. McInerney has been appointed president and chief operating officer.