SEATTLE — Issuer officials put a representative of Moody’s Investors Service on the defensive here Monday afternoon as they questioned the credibility of the three major rating agencies, which they faulted for delaying the “recalibration” of their municipal rating scales into a single global scale.

Gail Sussman, group managing director at Moody’s, was forced to defend her agency’s decision last October to delay the recalibration of its muni scale because of the unsettled conditions in the global credit markets.

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