The Jones and Laughlin Steel Corporation, also known as J&L Steel or simply as J&L, was an American steel and iron manufacturer that operated from 1852 until 1968. 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. Lauth's interest was bought in 1854 by James Laughlin. The first firm to bear the name of Jones and Laughlin was organized in 1861, and headquartered at Third & Ross in downtown Pittsburgh.
The Kansas City Bridge Company was a bridge building company that built many bridges throughout the Midwest United States in the early 1900s. The company was founded in 1893 and ceased business around 1960.
The Phoenix Iron Works, located in Phoenixville, Pennsylvania, was a manufacturer of iron and related products during the 19th century and early 20th century. Phoenix Iron Company was a major producer of cannon for the Union Army during the American Civil War. The company also produced the Phoenix column, an advance in construction material. Company facilities are a core component of the Phoenixville Historic District, a National Register of Historic Places site that was in 2006 recognized as a historic landmark by ASM International.
The King Iron Bridge & Manufacturing Company was a late-19th-century bridge building company located in Cleveland, Ohio. It was founded by Zenas King (1818–1892) in 1858 and subsequently managed by his sons, James A. King and Harry W. King and then his grandson, Norman C. King, until the mid-1920s. Many of the bridges built by the company were used during America's expansion west in the late 19th century and early 20th century, and some of these bridges are still standing today.
The Riverside Avenue Bridge is the only cast-iron bridge in Connecticut and one of a small number still in use in the United States. It carries Riverside Avenue over the New Haven Line railroad tracks in the Riverside section of Greenwich, Connecticut. The bridge was part of an earlier span built in 1871 over the Housatonic River by the New York and New Haven Railroad, and when that bridge was replaced, part of it was erected in Riverside in 1895. It was placed on the National Register of Historic Places in 1977.
The Wrought Iron Bridge Company was a bridge fabrication and construction company based in Canton, Ohio, United States. It specialized in the fabrication of iron truss bridges and was a prolific bridge builder in the late 19th century. It was one of the 28 firms consolidated by J. P. Morgan into the American Bridge Company in 1900. Many of its bridges have been listed on the National Register of Historic Places.
The Berlin Iron Bridge Company was a Berlin, Connecticut company that built iron bridges and buildings that were supported by iron. It is credited as the architect of numerous bridges and buildings now listed on the U.S. National Register of Historic Places. It eventually became part of the American Bridge Company.
Canton Bridge Company was a firm that was later incorporated into the American Bridge Company. The firm was established in Canton, Ohio, in 1892 and became one of the nation's biggest bridge-builders during the early 20th century. It designed and/or built many bridges that later became listed on the U.S. National Register of Historic Places (NRHP).
The Iowa Bridge Company was a company that designed and built many bridges that are listed on the U.S. National Register of Historic Places.
The Missouri Valley Bridge & Iron Co., also known as Missouri Valley Bridge Company, was a engineering, construction, and steel fabrication firm that operated through the late nineteenth and most of the twentieth centuries. It was based in Leavenworth, Kansas, with a WWII facility in Evansville, Indiana.
Topeka Bridge & Iron Co. was a bridge company. Its works include many bridges that are now listed on the U.S. National Register of Historic Places. Its Canyon Diablo Bridge was a concrete Luten arch bridge built in 1914. Its Amelia Park Bridge, for another example, was built in 1914.
Fargo Bridge & Iron Co. was a bridge company based in North Dakota in the early part of the 20th century.
George Herndon Pegram (1855–1937), most commonly known as George H. Pegram, was an engineer who patented the Pegram truss.
Clinton Bridge and Iron Works was a significant company in Clinton, Iowa.
The Groton Bridge Co. was an American construction company.
The Champion Bridge Company, formerly known as Champion Iron Bridge and Manufacturing Company, is a steel fabrication business based in Wilmington, Ohio, in the United States. It has been in business since the 1870s, and several of its works are listed on the National Register of Historic Places.
Monarch Engineering Co. was an American firm of Denver, Colorado, active in engineering and construction services. John A. Crook and his brother, Guy A. Crook of Falls City, were founders of the Monarch Engineering company which had its origin and main offices at Falls City, with offices in Kansas City, and Denver. Under the management of these men the Monarch Engineering company had risen to become an important and prosperous concern and a vast amount of bridge construction, city paving, irrigation-dam building, and public building work has been done under their supervision. Within ten years after the firm had been in operation, or since 1908, its activities constantly increased and in 1917 they purchased the Denver Steel and Iron Works in order to facilitate the material supply part of the construction work in which they were engaged.
The Illinois Steel Company was an American steel producer with five plants in Illinois and Wisconsin. Founded through a consolidation in 1889, Illinois Steel grew to become the largest steel producer in the United States. In 1898, several other steel and transportation companies were merged into it to form the Federal Steel Company, itself merged into U.S. Steel in 1901.
The Virginia Bridge & Iron Co., also known as Virginia Bridge Company, was a bridge company based in Roanoke, Virginia.
Nokesville Truss Bridge is a historic Pratt truss bridge carrying Virginia State Route 646 across the Norfolk Southern Railway near Nokesville, Prince William County, Virginia. It was built in 1882 by the Keystone Bridge Company. The single-span bridge measures 73 feet 11.5 inches (22.543 m) long, and is constructed of wrought iron.
