An engineer checks circuit boards at a telephone exchange. Most modern exchanges use solid-state devices to carry out the switching process,with computers to control the operation. This photograph was taken at Cincinnati Bell underground switching centre,Cincinnati,Ohio | |
Licence : | Droits gérés |
Crédit: | Science Photo Library / Snow, Andy |
Taille de l’image : | 3485 px × 5048 px |
Model Release : | Le droit n'est pas encore disponible. Merci de nous contacter avant utilisation. |
Property Release : | Non requis |
Restrictions : |
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