Seamless tube manufacture, Koppel Steel in Ambridge, PA, 2006, by Don Giles.
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Credit: Courtesy of the State Museum of Pennsylvania, Don Giles photo

Seamless tube production continues in Pennsylvania. A subsidiary of the NS Group, Inc., Koppel Steel manufactures seamless tubular products used in drilling, exploration, and transmission of oil and natural gas at its 200-acre plant in Koppell and it 20-acre plant in Ambridge, PA.

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