- Airport lighting transformers manufacturing
- Arc-welding transformers, separate solid-state, manufacturing
- Autotransformers for switchboards (except telephone switchboards) manufacturing
- Autotransformers manufacturing
- Ballasts (i.e., transformers) manufacturing
- Boosters, feeder voltage (i.e., electrical transformers), manufacturing
- Burner ignition transformers manufacturing
- Control transformers manufacturing
- Current limiting reactors, electrical, manufacturing
- Distribution transformers, electric, manufacturing
- Electric furnace transformers manufacturing
- Feeder voltage regulators and boosters (i.e., electrical transformers) manufacturing
- Fluorescent ballasts (i.e., transformers) manufacturing
- Fluorescent lighting transformers manufacturing
- Generator voltage regulators, electric induction and step-type (except engine electrical equipment), manufacturing
- Instrument transformers (except complete instruments) for metering or protective relaying use manufacturing
- Isolation transformers manufacturing
- Lamp ballasts manufacturing
- Lighting transformers manufacturing
- Lighting transformers, street and airport, manufacturing
- Line voltage regulators (i.e., electric transformers) manufacturing
- Luminous tube transformers manufacturing
- Machine tool transformers manufacturing
- Power transformers, electric, manufacturing
- Regulating transformers, power system-type, manufacturing
- Regulators (i.e., electric transformers), feeder voltage, manufacturing
- Saturable transformers manufacturing
- Signaling transformers, electric, manufacturing
- Specialty transformers, electric, manufacturing
- Substation transformers, electric power distribution, manufacturing
- Transformers, electric power, manufacturing
- Transformers, ignition, for use on domestic fuel burners, manufacturing
- Transformers, reactor, manufacturing
- Transformers, separate solid-state arc-welding, manufacturing
- Transmission and distribution voltage regulators manufacturing
- Voltage regulating transformers, electric power, manufacturing
- Voltage regulators, transmission and distribution, manufacturing
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