When Wells Fargo & Co. executives decided they wanted to look and act more like a full-service brokerage than a bank, they turned to Dean Witter Reynolds Inc. for investment savvy and services.

Under an arrangement announced last week, Wells will have access to the same products, research and knowledge as Dean Witter-a full-service brokerage firm-without having to build one from scratch. And Dean Witter, the retail brokerage arm of Morgan Stanley, Dean Witter, Discover Co., will have access to Wells' massive customer base.

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