Harbison-Walker Refractories Company - Credit: Wikimedia Commons
The Harbison-Walker Refractories Company is a national historic district and historic refractory brick manufacturing complex which is located in Mount Union in Huntingdon County, Pennsylvania. It originated as the Star Firebrick Company on March 7, 1865, with Articles of Association by a group of Pittsburgh and Allegheny residents. Read more on Wikipedia
Source: en.wikipedia.org