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"Genuine Connellsville Coke," H. C. Frick Coke Company lithograph, circa 1880.
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Genuine Connellsville coke engraving

Credit: Library of Congress

By the time it produced this lithograph to advertise its production of Connellsville coke, the H. C. Frick Company, with 5,000 ovens and production capacity of 8,750 tons a day, was already the leading producer of coke in western Pennsylvania.

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