The economic problems that have plagued Lowell, Mass., in the past several years just got worse: Wang Laboratories Inc., the city's largest employer and taxpayer, yesterday filed for Chapter 11 protection under the U.S. Bankruptcy Code.

Richard W. Miller, chairman and chief executive officer of Wang, said in a statement that the company has been struggling to get back on to its feet for the past three years. It came close, he added, but finally "ran out of time." The filing was made in the U.S. Bankruptcy Court, District of Massachusetts.

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