Elektrisk industri. Regulator för elgenerator. Public domain photograph - Sweden in 20th century, no copyright restrictions image - Picryl description
Elektrisk industri. Relä vid högspännings-transformatorer. Public domain photograph related to electrical equipment, industrial development, free to use, no copyright restrictions image - Picryl description
Elektrisk industri. Oljetransformator. Public domain photograph related to electrical equipment, industrial development, free to use, no copyright restrictions image - Picryl description