DETROIT -- The merger of Comerica Inc. and Manufacturers National Corp. took effect Thursday.

The combined company, known as Comerica Inc., has $24 billion in assets, more than 300 offices, and 9,600 employees. The subsidiary banks are to merge in August or September.

Gerald V. MacDonald, who headed Manufacturers National, is chairman and chief executive officer. Eugene A. Miller is president and chief operating officer.

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