What year did the company, who operated Slick Mine No. 91 after 1923, begin operations?
Slickville Historic District: Slickville Historic District is a national historic district located at Salem Township, Westmoreland County, Pennsylvania. Slickville Historic District:  The community was originally developed by the Cambria Steel Company, and later acquired by Bethlehem Steel who operated Slick Mine No. 91 after 1923. Bethlehem Steel: The Bethlehem Steel Corporation (commonly called Bethlehem Steel) was a steel and shipbuilding company that began operations in 1904 and was America's second-largest steel producer and largest shipbuilder.
1904