Yorkshire Electric Transformer Co
of Empire Works, Thornhill, Dewsbury.
1924 Private company. Initially manufactured transformers up to 100 kVA.
As the company expanded it specialized in the manufacture of medium and large power transformers.
By 1951 was manufacturing transformers up to 60MVA, 132kV.
1961 Electrical equipment and transformer manufacturers, covering ore type power transformers and magnetically shielded reactors for generation, transmission and distribution. 
Sources of Information
- 1961 Dun and Bradstreet KBE
- The Times, 24 September 1968
- The Times, March 25, 1977