50.3 MB (4.2 MB compressed)
3485 x 5048 pixels
29.5 x 42.7 cm ⏐ 11.6 x 16.8 in (300dpi)
ANDY SNOW / SCIENCE PHOTO LIBRARY ANDY SNOW / SCIENCE PHOTO LIBRARY
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.
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