The enterprise began as the American Iron Company, founded in 1852 by Bernard Lauth and Benjamin Franklin Jones, about 2.5 mi (4.0 km) south of Pittsburgh along the Monongahela River.The former Otis Steel company along the Cuyahoga River in Cleveland was purchased in 1942, and then in the mid-1960s, a finishing plant was constructed in Hennepin, Illinois.[6] In 1937, J&L was the subject of a landmark decision of the Supreme Court, NLRB v. Jones & Laughlin Steel Corp., which upheld the constitutionality of the Wagner Act and the Federal Government's power to regulate labor relations by way of the commerce clause.Mill 19, the last remaining structure from the Hazelwood Plant, is being refurbished to serve as a mixed use development including a robotics lab run by Carnegie Mellon University.The new furnaces included modern skip hoist and sealing arrangement for material charging, and two were expected to be finished in July 1907.[20] Jones & Laughlin Steel Co. is a builder of record for a number of bridges and other structures that are listed on the National Register of Historic Places.
Hot Metal Bridge
, formerly used by Jones and Laughlin to transport steel across the Monongahela River