Transformers; Distribution transformers; Apparatus and instruments for conducting, switching, transforming, accumulating, regulating or controlling the distribution or use of electricity; Apparatus and instruments for conducting, switching, transforming, accumulating, regulating or controlling the distribution or use of electric current; Apparatus and instruments for conveying, distributing, transforming, storing, regulating or controlling electric current; Electric transformers; Electric voltage transformers
Electrical and Scientific Apparatus