The Dudbridge Iron Works Limited of Stroud, Gloucestershire, England was a reciprocating engine manufacturer including Salmson water-cooled aero-engines under licence from Salmson in France from 1914 to 1918.
Book: Bullock, Arthur . Gloucestershire Between the Wars: A Memoir . The History Press . 2009 . 978-0-7524-4793-3. (Page 168)