MasterCard International announced Monday that it had recruited five more financial institutions - including three big regional banks - as members of Maestro U.S.A., its nascent electronic debit card system.

The nationwide system's new members, representing about two million ATM cardholders, are Mellon Bank, Pittsburgh; Bank of New York; Boatmen's Bancshares Inc., St. Louis; Liberty National Bank and Trust Lexington, Ky.; and CU Cooperative Systems Inc., an association representing 150 California credit unions.

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