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AMSC posts narrower loss

AMSC, a Devens company that makes products for wind turbines and energy grids, reported a second-quarter loss of $15.9 million, or 31 cents per share, compared with net loss of $51.7 million, or $1.02 per share, in the year-ago period.

Second-quarter revenues of $20.9 million were roughly flat with those of the same quarter a year ago.

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