By Ari Natter and Keith Laing An acrid smell hangs in the air at Trenton Forging Co. on the outskirts of Detroit as a 4,500-pound hammer slams a bar of red hot steel with enough force to shake the building. A worker uses tongs to position the piece, heated to 2,200 degrees, under the hammer, then onto a conveyor belt. The process is repeated 7,000 times a day at the
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