Pratt & Whitney
founded 1860
Pratt & Whitney was founded by Amos Whitney and Francis Pratt in Hartford, Ct in 1860. The company was a tool making company that began making guns during the civil war.
A company history and detailed timeline can be found at "Pratt & Whitney History Pictures," Pratt & Whitney, http://www.prattandwhitney.com/history.htm (accessed 05/12/2105)
Also on that website, a history of Pratt & Whitney from 1860 to 1930 is available: Accuracy for Seventy Years, 1860-1930.