Duff & Phelps Credit Rating Co. assigned an AA-minus rating to Comerica Bank-Michigan's recent $200 million issue of floating- rate notes.

Comerica Bank-Michigan is a subsidiary of Comerica Inc.

The notes, which will be sold through Morgan Stanley & Co., are due September 1995, month Treasury bills.

D&P said the rating reflected the bank's solid earnings, improved asset quality measures, and strong capital levels.

A lingering concern is the slow pace at which Comerica Inc. is integrating with Manufacturers National Corp., following a 1992 merger.

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