- Power and distribution transformers (4)
- Autotransformers, electric (power transformers) (2)
- Control transformers (1)
- Distribution transformers, electric (2)
- Generator voltage regulators (2)
- Power transformers, electric (3)
- Voltage regulating transformers, electric power (1)
- Voltage regulators, transmission and distribution (1)
- Fluorescent ballasts (1)
- Specialty transformers (5)
- Electronic meter transformers (2)
- Ignition transformers, for use on domestic fuel burners (1)
- Lighting transformers, fluorescent (1)
- Toy transformers (2)
