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 | |
Lizenzart: | Lizenzpflichtig |
Credit: | Science Photo Library / Snow, Andy |
Bildgröße: | 3485 px × 5048 px |
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Eigentums-Rechte: | nicht erforderlich |
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