The United Hammer Co. bought the Dupont power hammer line from E. & T. Fairbanks & Co. in 1917. In 1924 United Hammer was acquired by Barbour-Stockwell Co., which took over production of the Dupont power hammer.
Information Sources
- Iron Trade Review, Volume 60, 18 Jan 1917, pg. 224
- From a 1924 issue of American Machinist: "The United Hammer Co., Everett, Mass., has been purchased by the Barbour, Stockwell Co., Cambridge, Mass."