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Railways - A History in Drawings
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Components of ERNIE I.
Avia quartz crystal watch, c 1972.
Fairchild digital quartz wristwatch with LED display, 1970-1979.
Two metal rectifiers, c 1940s.
Avia quartz digital watch, c 1972.
Waltham quartz wristwatch with LCD display, c 1976.
Hamilton 'Pulsar' digital wristwatch, 1970.
Zenith quartz watch with both analogue and digital display, 1976.
Fleming's oscillation valves, c 1903.
Fleming's oscillation valve, c 1903.
Marconi-Fleming valve radio receiver, c 1908.
De Forest thermionic triode valve, c 1907.
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