Dry-type transformers; Electric mains transformers; Electric transformers; Electrical transformers; Electrical reducing transformers; Electricity transformers; High voltage transformers; Frequency transformers; Encased air-cooled transformers; Impedance transformers; Electric power supplies being transformers for marine use; Electrical power packs comprising transformers and rectifiers; Regulating transformers; Step-up transformers; Transformer units; Transformers (electricity); Transformers being electromagnetic devices for industrial applications; Transformers being electromagnetic devices for military applications; Voltage transformers