China comprehensively lost an appeal on Thursday against a World Trade Organization ruling in a dispute over U.S. exports of a specialty steel product that is primarily made in the presidential battleground states of Ohio and Pennsylvania.

The dispute involved duties imposed by China on "grain-oriented electrical steel", which is used in the cores of high-efficiency transformers, electric motors and generators, and is made by AK Steel Corp. and ATI Allegheny Ludlum...

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