WASHINGTON -- The Treasury Department announced yesterday major rule changes in the auction process for U.S. government securities, including measures designed to open up sales to all registered broker-dealers who bid on behalf of customers.

The changes are in addition to measures announced Sept. 11 that were aimed at improving oversight of the Treasury bond marker in the wake of the Salomon Brothers Inc. scandal that prompted an ongoing federal inquiry into illicit bidding by the firm at several auctions.

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