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Coke Works in Shamrock, 1963.
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Shamrock Coke Works in blast.

Credit: Courtesy of The Coal and Coke Heritage Center, Penn State Fayette, www.coalandcokepsu.org/

The first by-product ovens were constructed in Pennsylvania at Dunbar, Fayette County, in 1894, and by-product ovens replaced beehive ovens as the standard means of making coke.

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