For a good company history, see "Sargent & Co.," Davistown Musem, http://www.davistownmuseum.org/bioSargent.htm (accessed 0629/2015)
Sargent & Co's successor company, the Sargent Manufacturing Company, is still in business and has a good company history see "History of Sargent," Sargen, http://www.sargentlock.com/about/ (accessed 0629/2015)