In electronics, a Dekatron (or Decatron, or generically three-phase gas counting tube or glow-transfer counting tube or cold cathode tube) is a gas-filled decade counting tube. Dekatrons were used in computers, calculators and other counting-related products during the 1950s and 1960s. `Dekatron,` now a generic trademark, was the brand name used.....
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http://en.wikipedia.org/wiki/Dekatron
A dekatron is a gas-filled cold-cathode electron tube, having a central anode and ten effective cathodes, used in electronic counting circuits.
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http://www.probertencyclopaedia.com/browse/GD.HTM
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