First Cement
David O. Saylor was the first to make portland cement in the United States, at Coplay in 1871. First use of the rotary kiln to manufacture cement on a commercial scale also was here Nov. 8, 1889.
David Rumsey Map Collection, Stanford LibrariesDavid Rumsey Map Collection, Stanford LibrariesBarry Lawrence Ruderman Map Collection, Stanford LibrariesDavid Rumsey Map Collection, Stanford LibrariesBarry Lawrence Ruderman Map Collection, Stanford Libraries
Marker data: Pennsylvania Historical and Museum Commission via data.pa.gov
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