Silent screen

By Barry Fox SPIES won’t welcome the development of the world’s first flat-panel cathode ray tube, because they won’t find it so easy to sit outside a building and pick up the signals from a VDU inside. Instead of using “leaky” electric coils to steer an electron beam around a TV screen, IBM’s new display uses permanent magnets which give nothing away. But the new CRT from IBM’s lab in Greenock, near Glasgow,
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