Grace's Guide is the leading source of historical information on industry and manufacturing in Britain. This web publication contains 138,194 pages of information and 223,451 images on early companies, their products and the people who designed and built them.
Firth-Derihon Stampings Ltd. of Sheffield.
Owned by Thomas Firth and John Brown
1919 Private company.
1937 Drop forgers and stampers. "B N C", "B N D" Alloy Steels. "F.D.V.I." Alloy Steels. 
1959 Increased capacity at Darley Dale Works. Large consumer of special steels produced by Thomas Firth and John Brown..
1961 Manufacturers of drop forgings, stampings and pressings in high stress, heat resisting alloys for aircraft and automobile industry and nuclear power stations. 650 employees.