Grace's Guide is the leading source of historical information on industry and manufacturing in Britain. This web publication contains 135,204 pages of information and 215,454 images on early companies, their products and the people who designed and built them.
Seebohm and Dieckstahl of Dannamora Steel Works, Sheffield
Known for its range of special steels and for using and making known a scientific approach to steel making.
1899 Incorporated as a limited company.
1914 Directory: Manufacturers of crucible cast steel for tools etc. 
1914 Steel manufacturers. Specialities: "Capital" high-speed and "DSW" steels, all kinds of crucible cast steel for tools etc., Siemens-Martin and Bessemer steels, hammers, saws, files, picks etc. 
WWI Became Arthur Balfour and Co as anti-German feelings increased