Rocketdyne
The Rocketdyne Division was founded by North American Aviation (NAA) in 1955, and was later part of Rockwell International (1967-1996) and Boeing (1996-2005). In 2005, the Rocketdyne Division was sold to United Technologies Corporation, becoming Pratt & Whitney Rocketdyne as part of Pratt & Whitney. In 2013, Pratt & Whitney Rocketdyne was sold to GenCorp, which merged it with Aerojet to form Aerojet Rocketdyne.
Rockwood, Tennessee
Union general John T. Wilder, who in the 1850s had managed a foundry in Indiana, noted the iron ore and coal deposits of the Cumberland Plateau region while operating in the area during the Civil War. After the war, Wilder and Ohio-born Knoxville Iron Company founder Hiram Chamberlain (1835–1916) purchased at what is now Rockwood, selecting the location due to the ore and coal resources at the base of Walden Ridge, the proximity to the Tennessee River, and an assumption that the encroaching railroads would descend the Plateau at nearby Emory Gap. Wilder and Chamberlain enlisted several other investors from Indiana and Ohio, and the Roane Iron Company was chartered on June 18, 1867. By late 1868, the company had constructed a blast furnace with a capacity of 15 tons per day between the ridge and the end of what is now Rockwood Street.