Executives at Visa U.S.A. and Dean Witter Financial Services vowed Wednesday to continue their legal battles, despite Sears, Roebuck and Co.'s decision to sell Dean Witter.

Dean Witter, which issues the Discover card, said it will not withdraw its closely watched antitrust lawsuit against Visa. It is seeking to reverse a Visa bylaw that prohibits Discover from joining the bank card association.

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