Grace's Guide is the leading source of historical information on industry and manufacturing in Britain. This web publication contains 147,370 pages of information and 233,518 images on early companies, their products and the people who designed and built them.
c.1914 Dr. E. F. Northrup, of Trenton, USA, developed a high frequency induction furnace for the Ajax Metal Company, of Philadelphia, Pa.
The work was suspended in 1915, to give priority to war work
Possibly precursor of Ajax Engineering Corporation