I've seen several Nixie tube based clocks [1] this past year, but none quite like this Nixie tube clock [2], which uses only capacitors, resistors, diodes and lamps for the timing circuits.
So I guess you could call this an analog Nixie tube clock.
=> [1] http://clusty.com/search?query=Nixie+tube+clock | [2] http://wwwhome.cs.utwente.nl/~ptdeboer/ham/neonclock/
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